C# and WPF tutorial files

WPF/02-TreeViewsAndValueConverters/WpfTreeView/MainWindow.xaml

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+<Window x:Class="WpfTreeView.MainWindow"
+        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:local="clr-namespace:WpfTreeView"
+        Loaded="Window_Loaded"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="350" Width="525">
+    <Grid>
+
+        <TreeView x:Name="FolderView">
+            <TreeView.Resources>
+
+                <Style TargetType="{x:Type TreeViewItem}">
+                    <Setter Property="HeaderTemplate">
+                        <Setter.Value>
+                            <DataTemplate>
+                                <StackPanel Orientation="Horizontal">
+                                    <Image Width="20" Margin="3" 
+                                        Source="{Binding
+                                            RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type TreeViewItem}},
+                                            Path=Tag,
+                                            Converter={x:Static local:HeaderToImageConverter.Instance}}" />
+                                    <TextBlock VerticalAlignment="Center" Text="{Binding}" />
+                                </StackPanel>
+                            </DataTemplate>
+                        </Setter.Value>
+                    </Setter>
+                </Style>
+            </TreeView.Resources>
+        </TreeView>
+    </Grid>
+</Window>