<Window x:Class="DataBinding.DirectoryTreeView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="DirectoryTreeView" Height="300" Width="300"
    >
    <Grid Margin="3">
      <TreeView Name="treeFileSystem" TreeViewItem.Expanded="item_Expanded">
        
      </TreeView>
    </Grid>
</Window>
