Avalonia/samples/ControlCatalog/MainView.xaml

<UserControl xmlns="https://github.com/avaloniaui"
        xmlns:pages="clr-namespace:ControlCatalog.Pages"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Class="ControlCatalog.MainView"
        Background="{DynamicResource ThemeBackgroundBrush}"
        Foreground="{DynamicResource ThemeForegroundBrush}"
        FontSize="{DynamicResource FontSizeNormal}">
  <Grid>
    <ComboBox x:Name="Themes" SelectedIndex="0" Width="100" Margin="8" HorizontalAlignment="Right" VerticalAlignment="Bottom">
      <ComboBoxItem>Light</ComboBoxItem>
      <ComboBoxItem>Dark</ComboBoxItem>
    </ComboBox>
    <TabControl Classes="sidebar" Name="Sidebar">
      <TabItem Header="AutoCompleteBox"><pages:AutoCompleteBoxPage/></TabItem>
      <TabItem Header="Border"><pages:BorderPage/></TabItem>
      <TabItem Header="Button"><pages:ButtonPage/></TabItem>
      <TabItem Header="ButtonSpinner"><pages:ButtonSpinnerPage/></TabItem>
      <TabItem Header="Calendar"><pages:CalendarPage/></TabItem>
      <TabItem Header="Canvas"><pages:CanvasPage/></TabItem>
      <TabItem Header="Carousel"><pages:CarouselPage/></TabItem>
      <TabItem Header="CheckBox"><pages:CheckBoxPage/></TabItem>
      <TabItem Header="ComboBox"><pages:ComboBoxPage/></TabItem>
      <TabItem Header="ContextMenu"><pages:ContextMenuPage/></TabItem>
      <TabItem Header="DataGrid"><pages:DataGridPage/></TabItem>
      <TabItem Header="DatePicker"><pages:DatePickerPage/></TabItem>
      <TabItem Header="Drag+Drop"><pages:DragAndDropPage/></TabItem>
      <TabItem Header="Ellipse"><pages:EllipsePage/></TabItem>
      <TabItem Header="Expander"><pages:ExpanderPage/></TabItem>
      <TabItem Header="Image"><pages:ImagePage/></TabItem>
      <TabItem Header="LayoutTransformControl"><pages:LayoutTransformControlPage/></TabItem>
      <TabItem Header="Line"><pages:LinePage/></TabItem>
      <TabItem Header="ListBox"><pages:ListBoxPage/></TabItem>
      <TabItem Header="Menu"><pages:MenuPage/></TabItem>
	  <TabItem Header="NumericUpDown"><pages:NumericUpDownPage/></TabItem>
      <TabItem Header="ProgressBar"><pages:ProgressBarPage/></TabItem>
      <TabItem Header="RadioButton"><pages:RadioButtonPage/></TabItem>
      <TabItem Header="Rectangle"><pages:RectanglePage/></TabItem>
      <TabItem Header="Slider"><pages:SliderPage/></TabItem>
      <TabItem Header="TabControl"><pages:TabControlPage/></TabItem>
      <TabItem Header="TextBox"><pages:TextBoxPage/></TabItem>
      <TabItem Header="ToolTip"><pages:ToolTipPage/></TabItem>
      <TabItem Header="TreeView"><pages:TreeViewPage/></TabItem>
      <TabItem Header="Viewbox"><pages:ViewboxPage/></TabItem>
    </TabControl>
  </Grid>
</UserControl>