Avalonia/samples/RenderTest/MainWindow.xaml

<Window xmlns="https://github.com/avaloniaui"
        Title="Avalonia Render Test"
        xmlns:pages="clr-namespace:RenderTest.Pages;assembly=RenderTest">
  <DockPanel>
    <Menu DockPanel.Dock="Top">
      <MenuItem Header="Rendering">
        <MenuItem Header="Draw Dirty Rects" Command="{Binding ToggleDrawDirtyRects}">
          <MenuItem.Icon>
            <CheckBox BorderThickness="0" 
                      IsHitTestVisible="False"
                      IsChecked="{Binding DrawDirtyRects}"/>
          </MenuItem.Icon>
        </MenuItem>
        <MenuItem Header="Draw FPS" Command="{Binding ToggleDrawFps}">
          <MenuItem.Icon>
            <CheckBox BorderThickness="0"
                      IsHitTestVisible="False"
                      IsChecked="{Binding DrawFps}"/>
          </MenuItem.Icon>
        </MenuItem>
      </MenuItem>
    </Menu>
    
    <TabControl Classes="sidebar">
      <TabControl.Transition>
        <CrossFade Duration="0.25"/>
      </TabControl.Transition>
      <TabItem Header="Animations"><pages:AnimationsPage/></TabItem>
      <TabItem Header="Clipping"><pages:ClippingPage/></TabItem>
    </TabControl>
  </DockPanel>
</Window>