PettingZoo/PettingZoo.Tapeti/UI/ClassSelection/ClassSelectionWindow.xaml

<Window x:Class="PettingZoo.Tapeti.UI.ClassSelection.ClassSelectionWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
        xmlns:controls="clr-namespace:PettingZoo.WPF.Controls;assembly=PettingZoo.WPF"
        xmlns:classSelection="clr-namespace:PettingZoo.Tapeti.UI.ClassSelection"
        xmlns:svgc="http://sharpvectors.codeplex.com/svgc/"
        mc:Ignorable="d" 
        Title="{x:Static classSelection:ClassSelectionStrings.WindowTitle}" 
        Height="600" 
        Width="800"
        ResizeMode="CanResizeWithGrip"
        WindowStartupLocation="CenterOwner"
        d:DataContext="{d:DesignInstance classSelection:DesignTimeClassSelectionViewModel, IsDesignTimeCreatable=True}">
    <Window.Resources>
        <ResourceDictionary>
            <Style x:Key="TreeItemIcon" TargetType="{x:Type Image}">
                <Setter Property="Margin" Value="2,2,8,2" />
            </Style>

            <Style x:Key="TreeItemLabel" TargetType="{x:Type TextBlock}">
                <Setter Property="VerticalAlignment" Value="Center" />
            </Style>

            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="pack://application:,,,/PettingZoo.WPF;component/Style.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Window.Resources>

    <controls:GridLayout Style="{StaticResource Form}" Margin="8">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>

        <TreeView Grid.Row="0" ItemsSource="{Binding Examples}" SelectedItemChanged="TreeView_OnSelectedItemChanged">
            <TreeView.ItemContainerStyle>
                <Style TargetType="{x:Type TreeViewItem}">
                    <Setter Property="IsExpanded" Value="True" />
                </Style>
            </TreeView.ItemContainerStyle>
            <TreeView.Resources>
                <HierarchicalDataTemplate DataType="{x:Type classSelection:NamespaceFolderClassTreeItem}" ItemsSource="{Binding Children}">
                    <StackPanel Orientation="Horizontal">
                        <!-- 
                            I couldn't get the image assets to work from within this assembly, so I've simply included them in the main application. 
                            Not pretty, and it still doesn't show up in design-time, but works at runtime for now. 
                        -->
                        <Image Source="{svgc:SvgImage Source=/Images/Folder.svg, AppName=PettingZoo}" Width="16" Height="16" Style="{StaticResource TreeItemIcon}"/>
                        <TextBlock Text="{Binding Name}" Style="{StaticResource TreeItemLabel}" />
                    </StackPanel>
                </HierarchicalDataTemplate>
                <HierarchicalDataTemplate DataType="{x:Type classSelection:ExampleTreeItem}">
                    <StackPanel Orientation="Horizontal">
                        <Image Source="{svgc:SvgImage Source=/Images/Example.svg, AppName=PettingZoo}" Width="16" Height="16" Style="{StaticResource TreeItemIcon}"/>
                        <TextBlock Text="{Binding Name}" Style="{StaticResource TreeItemLabel}" />
                    </StackPanel>
                </HierarchicalDataTemplate>
            </TreeView.Resources>
        </TreeView>

        <StackPanel Grid.Row="1" Orientation="Horizontal" HorizontalAlignment="Right" Style="{StaticResource FooterPanel}">
            <Button Content="{x:Static classSelection:ClassSelectionStrings.ButtonSelect}" Style="{StaticResource FooterButton}" Command="{Binding SelectCommand}" />
            <Button Content="{x:Static classSelection:ClassSelectionStrings.ButtonCancel}"  Style="{StaticResource FooterButton}" />
        </StackPanel>
    </controls:GridLayout>
</Window>