Folder Tree WPF Control: Part 1 - View

FolderTree.xaml

<UserControl x:Class="GeekJ.FolderTreeControl.FolderTree"
             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="300" d:DesignWidth="300"
             Loaded="FolderTree_Loaded">
    <Grid>
        <TreeView ItemsSource="{Binding Path=Drives}">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding Path=Folders}">
                    <TextBlock Text="{Binding Path=Label}" />
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>
    </Grid>
</UserControl>

FolderTree.xaml.cs

namespace GeekJ.FolderTreeControl
{
    public partial class FolderTree : UserControl
    {
        public FolderTree()
        {
            InitializeComponent();
        }

        private void FolderTree_Loaded(object sender, RoutedEventArgs e)
        {
            // default the datacontext if it hasn't been set or isn't the expected type
            if (this.DataContext == null || !(this.DataContext is FolderTreeViewModel))
            {
                this.DataContext = new Model.FolderTreeViewModel();
            }
        }
    }
}