src/VisualStudio/VisualStudioDiagnosticsToolWindow/VenusMargin/ProjectionBufferMargin.xaml

<UserControl
    x:Class="Roslyn.Hosting.Diagnostics.VenusMargin.ProjectionBufferMargin"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    mc:Ignorable="d"
    d:DesignHeight="20"
    d:DesignWidth="500">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition
                Width="auto" />
            <ColumnDefinition
                Width="*" />
        </Grid.ColumnDefinitions>

        <Menu VerticalAlignment="Center">
            <MenuItem
                Header="buffers"
                ItemsSource="{Binding SourceBuffers}">
                <MenuItem.ItemTemplate>
                    <DataTemplate>
                        <Button
                            Content="{Binding ContentType}"
                            Click="Button_Click"
                            Tag="{Binding}" />
                    </DataTemplate>
                </MenuItem.ItemTemplate>
            </MenuItem>
        </Menu>

        <ListView
            Grid.Column="1"
            ItemsSource="{Binding SourceSpans}"
            SelectionChanged="ListView_SelectionChanged"
            SelectionMode="Single">
            <ListView.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal" />
                </ItemsPanelTemplate>
            </ListView.ItemsPanel>
            <ListView.ItemTemplate>
                <DataTemplate>
                    <Border
                        BorderBrush="Black"
                        BorderThickness="1"
                        Padding="1">
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="{Binding Path=Snapshot.ContentType.DisplayName}" />
                            <TextBlock Text="{Binding Path=Span}" />
                        </StackPanel>
                    </Border>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </Grid>
</UserControl>