Avalonia/src/Avalonia.Diagnostics/Diagnostics/Views/MainView.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:views="clr-namespace:Avalonia.Diagnostics.Views"
             x:Class="Avalonia.Diagnostics.Views.MainView">
  <Grid Name="rootGrid" RowDefinitions="Auto,Auto,*,Auto,0,Auto">
    <Menu>
      <MenuItem Header="_File">
        <MenuItem Header="E_xit" Command="{Binding $parent[Window].Close}" />
      </MenuItem>
      <MenuItem Header="_View">
        <MenuItem Header="_Console" Command="{Binding $parent[UserControl].ToggleConsole}">
          <MenuItem.Icon>
            <CheckBox BorderThickness="0"
                      IsChecked="{Binding Console.IsVisible}"
                      IsEnabled="False" />
          </MenuItem.Icon>
        </MenuItem>
      </MenuItem>
      <MenuItem Header="_Options">
        <MenuItem Header="Visualize margin/padding" Command="{Binding ToggleVisualizeMarginPadding}">
          <MenuItem.Icon>
            <CheckBox BorderThickness="0"
                      IsChecked="{Binding ShouldVisualizeMarginPadding}"
                      IsEnabled="False" />
          </MenuItem.Icon>
        </MenuItem>
        <MenuItem Header="Visualize dirty rects" Command="{Binding ToggleVisualizeDirtyRects}">
          <MenuItem.Icon>
            <CheckBox BorderThickness="0"
                      IsChecked="{Binding ShouldVisualizeDirtyRects}"
                      IsEnabled="False" />
          </MenuItem.Icon>
        </MenuItem>
        <MenuItem Header="Show fps overlay" Command="{Binding ToggleFpsOverlay}">
          <MenuItem.Icon>
            <CheckBox BorderThickness="0"
                      IsChecked="{Binding ShowFpsOverlay}"
                      IsEnabled="False" />
          </MenuItem.Icon>
        </MenuItem>
      </MenuItem>
    </Menu>

    <TabStrip Grid.Row="1" SelectedIndex="{Binding SelectedTab, Mode=TwoWay}">
      <TabStripItem Content="Logical Tree" />
      <TabStripItem Content="Visual Tree" />
      <TabStripItem Content="Events" />
    </TabStrip>

    <ContentControl Grid.Row="2"
                    BorderBrush="{DynamicResource ThemeControlMidBrush}"
                    BorderThickness="0,1,0,0"
                    Content="{Binding Content}" />

    <GridSplitter Name="consoleSplitter" Grid.Row="3" Height="1"
                  Background="{DynamicResource ThemeControlMidBrush}"
                  IsVisible="False" />

    <views:ConsoleView Name="console"
                       Grid.Row="4"
                       DataContext="{Binding Console}"
                       IsVisible="{Binding IsVisible}" />


    <Border Grid.Row="5"
            BorderBrush="{DynamicResource ThemeControlMidBrush}"
            BorderThickness="0,1,0,0">
      <Grid ColumnDefinitions="*, Auto">
        <StackPanel Grid.Column="0" Spacing="4" Orientation="Horizontal">
          <TextBlock>Hold Ctrl+Shift over a control to inspect.</TextBlock>
          <Separator Width="8" />
          <TextBlock>Focused:</TextBlock>
          <TextBlock Text="{Binding FocusedControl}" />
          <Separator Width="8" />
          <TextBlock>Pointer Over:</TextBlock>
          <TextBlock Text="{Binding PointerOverElement}" />
        </StackPanel>

        <TextBlock Grid.Column="1"
                   Foreground="Gray"
                   Margin="2 0"
                   Text="Popups frozen"
                   IsVisible="{Binding FreezePopups}" />
      </Grid>

    </Border>
  </Grid>
</UserControl>