diff --git a/README.markdown b/README.markdown
index 9bcca02..7d2a9a8 100644
--- a/README.markdown
+++ b/README.markdown
@@ -48,6 +48,7 @@ ui.window()
 
     target/debug/examples/hello_world
     target/debug/examples/test_window
+    target/debug/examples/test_window_impl
 
 ## License
 
diff --git a/examples/test_window.rs b/examples/test_window.rs
index ff6c62a..071024a 100644
--- a/examples/test_window.rs
+++ b/examples/test_window.rs
@@ -4,320 +4,20 @@ extern crate glium;
 extern crate imgui;
 extern crate time;
 
-use imgui::*;
-
 use self::support::Support;
 
 mod support;
 
-struct State {
-    clear_color: (f32, f32, f32, f32),
-    show_app_metrics: bool,
-    show_app_main_menu_bar: bool,
-    show_app_console: bool,
-    show_app_layout: bool,
-    show_app_long_text: bool,
-    show_app_auto_resize: bool,
-    show_app_fixed_overlay: bool,
-    show_app_custom_rendering: bool,
-    show_app_manipulating_window_title: bool,
-    show_app_about: bool,
-    no_titlebar: bool,
-    no_border: bool,
-    no_resize: bool,
-    no_move: bool,
-    no_scrollbar: bool,
-    no_collapse: bool,
-    no_menu: bool,
-    bg_alpha: f32,
-    auto_resize_state: AutoResizeState,
-    file_menu: FileMenuState
-}
-
-impl Default for State {
-    fn default() -> Self {
-        State {
-            clear_color: (114.0 / 255.0, 144.0 / 255.0, 154.0 / 255.0, 1.0),
-            show_app_metrics: false,
-            show_app_main_menu_bar: false,
-            show_app_console: false,
-            show_app_layout: false,
-            show_app_long_text: false,
-            show_app_auto_resize: false,
-            show_app_fixed_overlay: false,
-            show_app_custom_rendering: false,
-            show_app_manipulating_window_title: false,
-            show_app_about: false,
-            no_titlebar: false,
-            no_border: true,
-            no_resize: false,
-            no_move: false,
-            no_scrollbar: false,
-            no_collapse: false,
-            no_menu: false,
-            bg_alpha: 0.65,
-            auto_resize_state: Default::default(),
-            file_menu: Default::default()
-        }
-    }
-}
-
-struct FileMenuState {
-    enabled: bool
-}
-
-impl Default for FileMenuState {
-    fn default() -> Self {
-        FileMenuState {
-            enabled: true
-        }
-    }
-}
-
-struct AutoResizeState {
-    lines: i32
-}
-
-impl Default for AutoResizeState {
-    fn default() -> Self {
-        AutoResizeState {
-            lines: 10
-        }
-    }
-}
+const CLEAR_COLOR: (f32, f32, f32, f32) = (1.0, 1.0, 1.0, 1.0);
 
 fn main() {
-    let mut state = State::default();
     let mut support = Support::init();
-    let mut opened = true;
 
-    loop {
-        let active = support.render(state.clear_color, |ui| {
-            show_test_window(ui, &mut state, &mut opened);
+     loop {
+        let mut open = true;
+        let active = support.render(CLEAR_COLOR, |ui| {
+            ui.show_test_window(&mut open)
         });
-        if !active || !opened { break }
+        if !active || !open { break }
     }
 }
-
-fn show_user_guide<'a>(ui: &Ui<'a>) {
-    ui.bullet_text(im_str!("Double-click on title bar to collapse window."));
-    ui.bullet_text(im_str!("Click and drag on lower right corner to resize window."));
-    ui.bullet_text(im_str!("Click and drag on any empty space to move window."));
-    ui.bullet_text(im_str!("Mouse Wheel to scroll."));
-    ui.bullet_text(im_str!("TAB/SHIFT+TAB to cycle through keyboard editable fields."));
-    ui.bullet_text(im_str!("CTRL+Click on a slider or drag box to input text."));
-    ui.bullet_text(im_str!(
-"While editing text:
-- Hold SHIFT or use mouse to select text
-- CTRL+Left/Right to word jump
-- CTRL+A or double-click to select all
-- CTRL+X,CTRL+C,CTRL+V clipboard
-- CTRL+Z,CTRL+Y undo/redo
-- ESCAPE to revert
-- You can apply arithmetic operators +,*,/ on numerical values.
-  Use +- to subtract."));
-}
-
-fn show_test_window<'a>(ui: &Ui<'a>, state: &mut State, opened: &mut bool) {
-    if state.show_app_metrics {
-        ui.show_metrics_window(&mut state.show_app_metrics);
-    }
-    if state.show_app_main_menu_bar { show_example_app_main_menu_bar(ui, state) }
-    if state.show_app_auto_resize {
-        show_example_app_auto_resize(ui, &mut state.auto_resize_state, &mut state.show_app_auto_resize);
-    }
-    if state.show_app_fixed_overlay {
-        show_example_app_fixed_overlay(ui, &mut state.show_app_fixed_overlay);
-    }
-    if state.show_app_manipulating_window_title {
-        show_example_app_manipulating_window_title(ui);
-    }
-    if state.show_app_about {
-        ui.window()
-            .name(im_str!("About ImGui"))
-            .always_auto_resize(true)
-            .opened(&mut state.show_app_about)
-            .build(|| {
-                ui.text(ImStr::from_str(&format!("ImGui {}", imgui::get_version())));
-                ui.separator();
-                ui.text(im_str!("By Omar Cornut and all github contributors."));
-                ui.text(im_str!("ImGui is licensed under the MIT License, see LICENSE for more information."));
-                show_user_guide(ui);
-            })
-    }
-
-    ui.window().name(im_str!("ImGui Demo"))
-        .title_bar(!state.no_titlebar)
-        .show_borders(!state.no_border)
-        .resizable(!state.no_resize)
-        .movable(!state.no_move)
-        .scroll_bar(!state.no_scrollbar)
-        .collapsible(!state.no_collapse)
-        .menu_bar(!state.no_menu)
-        .bg_alpha(state.bg_alpha)
-        .size((550.0, 680.0), ImGuiSetCond_FirstUseEver)
-        .opened(opened)
-        .build(|| {
-            ui.text(im_str!("ImGui says hello."));
-            ui.menu_bar(|| {
-                ui.menu(im_str!("Menu")).build(|| {
-                    show_example_menu_file(ui, &mut state.file_menu);
-                });
-                ui.menu(im_str!("Examples")).build(|| {
-                    ui.menu_item(im_str!("Main menu bar"))
-                        .selected(&mut state.show_app_main_menu_bar).build();
-                    ui.menu_item(im_str!("Console"))
-                        .selected(&mut state.show_app_console).build();
-                    ui.menu_item(im_str!("Simple layout"))
-                        .selected(&mut state.show_app_layout).build();
-                    ui.menu_item(im_str!("Long text display"))
-                        .selected(&mut state.show_app_long_text).build();
-                    ui.menu_item(im_str!("Auto-resizing window"))
-                        .selected(&mut state.show_app_auto_resize).build();
-                    ui.menu_item(im_str!("Simple overlay"))
-                        .selected(&mut state.show_app_fixed_overlay).build();
-                    ui.menu_item(im_str!("Manipulating window title"))
-                        .selected(&mut state.show_app_manipulating_window_title).build();
-                    ui.menu_item(im_str!("Custom rendering"))
-                        .selected(&mut state.show_app_custom_rendering).build();
-                });
-                ui.menu(im_str!("Help")).build(|| {
-                    ui.menu_item(im_str!("Metrics"))
-                        .selected(&mut state.show_app_metrics).build();
-                    ui.menu_item(im_str!("About ImGui"))
-                        .selected(&mut state.show_app_about).build();
-                });
-            });
-            ui.spacing();
-            if ui.collapsing_header(im_str!("Help")).build() {
-                ui.text_wrapped(im_str!("This window is being created by the show_test_window() function. Please refer to the code for programming reference.\n\nUser Guide:"));
-                show_user_guide(ui);
-            }
-
-            if ui.collapsing_header(im_str!("Window options")).build() {
-                ui.checkbox(im_str!("no titlebar"), &mut state.no_titlebar);
-                ui.same_line(150.0);
-                ui.checkbox(im_str!("no border"), &mut state.no_border);
-                ui.same_line(300.0);
-                ui.checkbox(im_str!("no resize"), &mut state.no_resize);
-                ui.checkbox(im_str!("no move"), &mut state.no_move);
-                ui.same_line(150.0);
-                ui.checkbox(im_str!("no scrollbar"), &mut state.no_scrollbar);
-                ui.same_line(300.0);
-                ui.checkbox(im_str!("no collapse"), &mut state.no_collapse);
-                ui.checkbox(im_str!("no menu"), &mut state.no_menu);
-                ui.slider_f32(im_str!("bg alpha"), &mut state.bg_alpha, 0.0, 1.0).build();
-            }
-        })
-}
-
-fn show_example_app_main_menu_bar<'a>(ui: &Ui<'a>, state: &mut State) {
-    ui.main_menu_bar(|| {
-        ui.menu(im_str!("File")).build(|| {
-            show_example_menu_file(ui, &mut state.file_menu);
-        });
-        ui.menu(im_str!("Edit")).build(|| {
-            ui.menu_item(im_str!("Undo")).shortcut(im_str!("CTRL+Z")).build();
-            ui.menu_item(im_str!("Redo"))
-                .shortcut(im_str!("CTRL+Y")).enabled(false).build();
-            ui.separator();
-            ui.menu_item(im_str!("Cut")).shortcut(im_str!("CTRL+X")).build();
-            ui.menu_item(im_str!("Copy")).shortcut(im_str!("CTRL+C")).build();
-            ui.menu_item(im_str!("Paste")).shortcut(im_str!("CTRL+V")).build();
-        });
-    });
-}
-
-fn show_example_menu_file<'a>(ui: &Ui<'a>, state: &mut FileMenuState) {
-    ui.menu_item(im_str!("(dummy menu)")).enabled(false).build();
-    ui.menu_item(im_str!("New")).build();
-    ui.menu_item(im_str!("Open")).shortcut(im_str!("Ctrl+O")).build();
-    ui.menu(im_str!("Open Recent")).build(|| {
-        ui.menu_item(im_str!("fish_hat.c")).build();
-        ui.menu_item(im_str!("fish_hat.inl")).build();
-        ui.menu_item(im_str!("fish_hat.h")).build();
-        ui.menu(im_str!("More..")).build(|| {
-            ui.menu_item(im_str!("Hello"));
-            ui.menu_item(im_str!("Sailor"));
-            ui.menu(im_str!("Recurse..")).build(|| {
-                show_example_menu_file(ui, state);
-            });
-        });
-    });
-    ui.menu_item(im_str!("Save")).shortcut(im_str!("Ctrl+S")).build();
-    ui.menu_item(im_str!("Save As..")).build();
-    ui.separator();
-    ui.menu(im_str!("Options")).build(|| {
-        ui.menu_item(im_str!("Enabled")).selected(&mut state.enabled).build();
-        // TODO
-    });
-    ui.menu(im_str!("Colors")).build(|| {
-        // TODO
-    });
-    ui.menu(im_str!("Disabled")).enabled(false).build(|| {
-        unreachable!();
-    });
-    let mut checked = true;
-    ui.menu_item(im_str!("Checked")).selected(&mut checked).build();
-    ui.menu_item(im_str!("Quit")).shortcut(im_str!("Alt+F4")).build();
-}
-
-fn show_example_app_auto_resize<'a>(ui: &Ui<'a>, state: &mut AutoResizeState, opened: &mut bool) {
-    ui.window()
-        .name(im_str!("Example: Auto-resizing window"))
-        .opened(opened)
-        .always_auto_resize(true)
-        .build(|| {
-            ui.text(im_str!("Window will resize every-ui to the size of its content.
-Note that you probably don't want to query the window size to
-output your content because that would create a feedback loop."));
-            ui.slider_i32(im_str!("Number of lines"), &mut state.lines, 1, 20).build();
-            for i in 0 .. state.lines {
-                ui.text(im_str!("{:2$}This is line {}", "", i, i as usize * 4));
-            }
-        })
-}
-
-fn show_example_app_fixed_overlay<'a>(ui: &Ui<'a>, opened: &mut bool) {
-    ui.window()
-        .name(im_str!("Example: Fixed Overlay"))
-        .opened(opened)
-        .bg_alpha(0.3)
-        .title_bar(false)
-        .resizable(false)
-        .movable(false)
-        .save_settings(false)
-        .build(|| {
-            ui.text(im_str!("Simple overlay\non the top-left side of the screen."));
-            ui.separator();
-            let mouse_pos = ui.imgui().mouse_pos();
-            ui.text(im_str!("Mouse Position: ({:.1},{:.1})", mouse_pos.0, mouse_pos.1));
-        })
-}
-
-fn show_example_app_manipulating_window_title<'a>(ui: &Ui<'a>) {
-    ui.window()
-        .name(im_str!("Same title as another window##1"))
-        .position((100.0, 100.0), ImGuiSetCond_FirstUseEver)
-        .build(|| {
-            ui.text(im_str!("This is window 1.
-My title is the same as window 2, but my identifier is unique."));
-        });
-    ui.window()
-        .name(im_str!("Same title as another window##2"))
-        .position((100.0, 200.0), ImGuiSetCond_FirstUseEver)
-        .build(|| {
-            ui.text(im_str!("This is window 2.
-My title is the same as window 1, but my identifier is unique."));
-        });
-    let chars = ['|', '/', '-', '\\'];
-    let ch_idx = (ui.imgui().get_time() / 0.25) as usize & 3;
-    let num = ui.imgui().get_frame_count(); // The C++ version uses rand() here
-    let title = im_str!("Animated title {} {}###AnimatedTitle", chars[ch_idx], num);
-    ui.window()
-        .name(title)
-        .position((100.0, 300.0), ImGuiSetCond_FirstUseEver)
-        .build(|| {
-            ui.text(im_str!("This window has a changing title"));
-        });
-}
diff --git a/examples/test_window_impl.rs b/examples/test_window_impl.rs
new file mode 100644
index 0000000..ff6c62a
--- /dev/null
+++ b/examples/test_window_impl.rs
@@ -0,0 +1,323 @@
+#[macro_use]
+extern crate glium;
+#[macro_use]
+extern crate imgui;
+extern crate time;
+
+use imgui::*;
+
+use self::support::Support;
+
+mod support;
+
+struct State {
+    clear_color: (f32, f32, f32, f32),
+    show_app_metrics: bool,
+    show_app_main_menu_bar: bool,
+    show_app_console: bool,
+    show_app_layout: bool,
+    show_app_long_text: bool,
+    show_app_auto_resize: bool,
+    show_app_fixed_overlay: bool,
+    show_app_custom_rendering: bool,
+    show_app_manipulating_window_title: bool,
+    show_app_about: bool,
+    no_titlebar: bool,
+    no_border: bool,
+    no_resize: bool,
+    no_move: bool,
+    no_scrollbar: bool,
+    no_collapse: bool,
+    no_menu: bool,
+    bg_alpha: f32,
+    auto_resize_state: AutoResizeState,
+    file_menu: FileMenuState
+}
+
+impl Default for State {
+    fn default() -> Self {
+        State {
+            clear_color: (114.0 / 255.0, 144.0 / 255.0, 154.0 / 255.0, 1.0),
+            show_app_metrics: false,
+            show_app_main_menu_bar: false,
+            show_app_console: false,
+            show_app_layout: false,
+            show_app_long_text: false,
+            show_app_auto_resize: false,
+            show_app_fixed_overlay: false,
+            show_app_custom_rendering: false,
+            show_app_manipulating_window_title: false,
+            show_app_about: false,
+            no_titlebar: false,
+            no_border: true,
+            no_resize: false,
+            no_move: false,
+            no_scrollbar: false,
+            no_collapse: false,
+            no_menu: false,
+            bg_alpha: 0.65,
+            auto_resize_state: Default::default(),
+            file_menu: Default::default()
+        }
+    }
+}
+
+struct FileMenuState {
+    enabled: bool
+}
+
+impl Default for FileMenuState {
+    fn default() -> Self {
+        FileMenuState {
+            enabled: true
+        }
+    }
+}
+
+struct AutoResizeState {
+    lines: i32
+}
+
+impl Default for AutoResizeState {
+    fn default() -> Self {
+        AutoResizeState {
+            lines: 10
+        }
+    }
+}
+
+fn main() {
+    let mut state = State::default();
+    let mut support = Support::init();
+    let mut opened = true;
+
+    loop {
+        let active = support.render(state.clear_color, |ui| {
+            show_test_window(ui, &mut state, &mut opened);
+        });
+        if !active || !opened { break }
+    }
+}
+
+fn show_user_guide<'a>(ui: &Ui<'a>) {
+    ui.bullet_text(im_str!("Double-click on title bar to collapse window."));
+    ui.bullet_text(im_str!("Click and drag on lower right corner to resize window."));
+    ui.bullet_text(im_str!("Click and drag on any empty space to move window."));
+    ui.bullet_text(im_str!("Mouse Wheel to scroll."));
+    ui.bullet_text(im_str!("TAB/SHIFT+TAB to cycle through keyboard editable fields."));
+    ui.bullet_text(im_str!("CTRL+Click on a slider or drag box to input text."));
+    ui.bullet_text(im_str!(
+"While editing text:
+- Hold SHIFT or use mouse to select text
+- CTRL+Left/Right to word jump
+- CTRL+A or double-click to select all
+- CTRL+X,CTRL+C,CTRL+V clipboard
+- CTRL+Z,CTRL+Y undo/redo
+- ESCAPE to revert
+- You can apply arithmetic operators +,*,/ on numerical values.
+  Use +- to subtract."));
+}
+
+fn show_test_window<'a>(ui: &Ui<'a>, state: &mut State, opened: &mut bool) {
+    if state.show_app_metrics {
+        ui.show_metrics_window(&mut state.show_app_metrics);
+    }
+    if state.show_app_main_menu_bar { show_example_app_main_menu_bar(ui, state) }
+    if state.show_app_auto_resize {
+        show_example_app_auto_resize(ui, &mut state.auto_resize_state, &mut state.show_app_auto_resize);
+    }
+    if state.show_app_fixed_overlay {
+        show_example_app_fixed_overlay(ui, &mut state.show_app_fixed_overlay);
+    }
+    if state.show_app_manipulating_window_title {
+        show_example_app_manipulating_window_title(ui);
+    }
+    if state.show_app_about {
+        ui.window()
+            .name(im_str!("About ImGui"))
+            .always_auto_resize(true)
+            .opened(&mut state.show_app_about)
+            .build(|| {
+                ui.text(ImStr::from_str(&format!("ImGui {}", imgui::get_version())));
+                ui.separator();
+                ui.text(im_str!("By Omar Cornut and all github contributors."));
+                ui.text(im_str!("ImGui is licensed under the MIT License, see LICENSE for more information."));
+                show_user_guide(ui);
+            })
+    }
+
+    ui.window().name(im_str!("ImGui Demo"))
+        .title_bar(!state.no_titlebar)
+        .show_borders(!state.no_border)
+        .resizable(!state.no_resize)
+        .movable(!state.no_move)
+        .scroll_bar(!state.no_scrollbar)
+        .collapsible(!state.no_collapse)
+        .menu_bar(!state.no_menu)
+        .bg_alpha(state.bg_alpha)
+        .size((550.0, 680.0), ImGuiSetCond_FirstUseEver)
+        .opened(opened)
+        .build(|| {
+            ui.text(im_str!("ImGui says hello."));
+            ui.menu_bar(|| {
+                ui.menu(im_str!("Menu")).build(|| {
+                    show_example_menu_file(ui, &mut state.file_menu);
+                });
+                ui.menu(im_str!("Examples")).build(|| {
+                    ui.menu_item(im_str!("Main menu bar"))
+                        .selected(&mut state.show_app_main_menu_bar).build();
+                    ui.menu_item(im_str!("Console"))
+                        .selected(&mut state.show_app_console).build();
+                    ui.menu_item(im_str!("Simple layout"))
+                        .selected(&mut state.show_app_layout).build();
+                    ui.menu_item(im_str!("Long text display"))
+                        .selected(&mut state.show_app_long_text).build();
+                    ui.menu_item(im_str!("Auto-resizing window"))
+                        .selected(&mut state.show_app_auto_resize).build();
+                    ui.menu_item(im_str!("Simple overlay"))
+                        .selected(&mut state.show_app_fixed_overlay).build();
+                    ui.menu_item(im_str!("Manipulating window title"))
+                        .selected(&mut state.show_app_manipulating_window_title).build();
+                    ui.menu_item(im_str!("Custom rendering"))
+                        .selected(&mut state.show_app_custom_rendering).build();
+                });
+                ui.menu(im_str!("Help")).build(|| {
+                    ui.menu_item(im_str!("Metrics"))
+                        .selected(&mut state.show_app_metrics).build();
+                    ui.menu_item(im_str!("About ImGui"))
+                        .selected(&mut state.show_app_about).build();
+                });
+            });
+            ui.spacing();
+            if ui.collapsing_header(im_str!("Help")).build() {
+                ui.text_wrapped(im_str!("This window is being created by the show_test_window() function. Please refer to the code for programming reference.\n\nUser Guide:"));
+                show_user_guide(ui);
+            }
+
+            if ui.collapsing_header(im_str!("Window options")).build() {
+                ui.checkbox(im_str!("no titlebar"), &mut state.no_titlebar);
+                ui.same_line(150.0);
+                ui.checkbox(im_str!("no border"), &mut state.no_border);
+                ui.same_line(300.0);
+                ui.checkbox(im_str!("no resize"), &mut state.no_resize);
+                ui.checkbox(im_str!("no move"), &mut state.no_move);
+                ui.same_line(150.0);
+                ui.checkbox(im_str!("no scrollbar"), &mut state.no_scrollbar);
+                ui.same_line(300.0);
+                ui.checkbox(im_str!("no collapse"), &mut state.no_collapse);
+                ui.checkbox(im_str!("no menu"), &mut state.no_menu);
+                ui.slider_f32(im_str!("bg alpha"), &mut state.bg_alpha, 0.0, 1.0).build();
+            }
+        })
+}
+
+fn show_example_app_main_menu_bar<'a>(ui: &Ui<'a>, state: &mut State) {
+    ui.main_menu_bar(|| {
+        ui.menu(im_str!("File")).build(|| {
+            show_example_menu_file(ui, &mut state.file_menu);
+        });
+        ui.menu(im_str!("Edit")).build(|| {
+            ui.menu_item(im_str!("Undo")).shortcut(im_str!("CTRL+Z")).build();
+            ui.menu_item(im_str!("Redo"))
+                .shortcut(im_str!("CTRL+Y")).enabled(false).build();
+            ui.separator();
+            ui.menu_item(im_str!("Cut")).shortcut(im_str!("CTRL+X")).build();
+            ui.menu_item(im_str!("Copy")).shortcut(im_str!("CTRL+C")).build();
+            ui.menu_item(im_str!("Paste")).shortcut(im_str!("CTRL+V")).build();
+        });
+    });
+}
+
+fn show_example_menu_file<'a>(ui: &Ui<'a>, state: &mut FileMenuState) {
+    ui.menu_item(im_str!("(dummy menu)")).enabled(false).build();
+    ui.menu_item(im_str!("New")).build();
+    ui.menu_item(im_str!("Open")).shortcut(im_str!("Ctrl+O")).build();
+    ui.menu(im_str!("Open Recent")).build(|| {
+        ui.menu_item(im_str!("fish_hat.c")).build();
+        ui.menu_item(im_str!("fish_hat.inl")).build();
+        ui.menu_item(im_str!("fish_hat.h")).build();
+        ui.menu(im_str!("More..")).build(|| {
+            ui.menu_item(im_str!("Hello"));
+            ui.menu_item(im_str!("Sailor"));
+            ui.menu(im_str!("Recurse..")).build(|| {
+                show_example_menu_file(ui, state);
+            });
+        });
+    });
+    ui.menu_item(im_str!("Save")).shortcut(im_str!("Ctrl+S")).build();
+    ui.menu_item(im_str!("Save As..")).build();
+    ui.separator();
+    ui.menu(im_str!("Options")).build(|| {
+        ui.menu_item(im_str!("Enabled")).selected(&mut state.enabled).build();
+        // TODO
+    });
+    ui.menu(im_str!("Colors")).build(|| {
+        // TODO
+    });
+    ui.menu(im_str!("Disabled")).enabled(false).build(|| {
+        unreachable!();
+    });
+    let mut checked = true;
+    ui.menu_item(im_str!("Checked")).selected(&mut checked).build();
+    ui.menu_item(im_str!("Quit")).shortcut(im_str!("Alt+F4")).build();
+}
+
+fn show_example_app_auto_resize<'a>(ui: &Ui<'a>, state: &mut AutoResizeState, opened: &mut bool) {
+    ui.window()
+        .name(im_str!("Example: Auto-resizing window"))
+        .opened(opened)
+        .always_auto_resize(true)
+        .build(|| {
+            ui.text(im_str!("Window will resize every-ui to the size of its content.
+Note that you probably don't want to query the window size to
+output your content because that would create a feedback loop."));
+            ui.slider_i32(im_str!("Number of lines"), &mut state.lines, 1, 20).build();
+            for i in 0 .. state.lines {
+                ui.text(im_str!("{:2$}This is line {}", "", i, i as usize * 4));
+            }
+        })
+}
+
+fn show_example_app_fixed_overlay<'a>(ui: &Ui<'a>, opened: &mut bool) {
+    ui.window()
+        .name(im_str!("Example: Fixed Overlay"))
+        .opened(opened)
+        .bg_alpha(0.3)
+        .title_bar(false)
+        .resizable(false)
+        .movable(false)
+        .save_settings(false)
+        .build(|| {
+            ui.text(im_str!("Simple overlay\non the top-left side of the screen."));
+            ui.separator();
+            let mouse_pos = ui.imgui().mouse_pos();
+            ui.text(im_str!("Mouse Position: ({:.1},{:.1})", mouse_pos.0, mouse_pos.1));
+        })
+}
+
+fn show_example_app_manipulating_window_title<'a>(ui: &Ui<'a>) {
+    ui.window()
+        .name(im_str!("Same title as another window##1"))
+        .position((100.0, 100.0), ImGuiSetCond_FirstUseEver)
+        .build(|| {
+            ui.text(im_str!("This is window 1.
+My title is the same as window 2, but my identifier is unique."));
+        });
+    ui.window()
+        .name(im_str!("Same title as another window##2"))
+        .position((100.0, 200.0), ImGuiSetCond_FirstUseEver)
+        .build(|| {
+            ui.text(im_str!("This is window 2.
+My title is the same as window 1, but my identifier is unique."));
+        });
+    let chars = ['|', '/', '-', '\\'];
+    let ch_idx = (ui.imgui().get_time() / 0.25) as usize & 3;
+    let num = ui.imgui().get_frame_count(); // The C++ version uses rand() here
+    let title = im_str!("Animated title {} {}###AnimatedTitle", chars[ch_idx], num);
+    ui.window()
+        .name(title)
+        .position((100.0, 300.0), ImGuiSetCond_FirstUseEver)
+        .build(|| {
+            ui.text(im_str!("This window has a changing title"));
+        });
+}