XAML CategoryViewer

<UserControl x:Class="ePharma.Silverlight.View.Controls.CategoryControl"
    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:vm="clr-namespace:ePharma.Silverlight.ViewModel"
    mc:Ignorable="d"
    xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk" Height="300" Width="300">

    <UserControl.Resources>
        <vm:MenuGroupBoxViewModel x:Key="MenuGroupBoxVM"></vm:MenuGroupBoxViewModel>

        <sdk:HierarchicalDataTemplate x:Key="SubItemTemplate" ItemsSource="{Binding Path=Categorie.SubCategorie}">
            <TextBlock Text="{Binding Path=SubCategoryId}" Foreground="Red"/>
        </sdk:HierarchicalDataTemplate>

        <sdk:HierarchicalDataTemplate x:Key="MainItemTemplate" ItemTemplate="{StaticResource SubItemTemplate}" >
            <TextBlock Text="{Binding Path=CategoryId}" Foreground="Blue"/>
        </sdk:HierarchicalDataTemplate>

    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White" DataContext="{Binding Source={StaticResource MenuGroupBoxVM}}">
        <sdk:TreeView Height="200" HorizontalAlignment="Left" Name="treeView" VerticalAlignment="Top" Width="174"
                      ItemTemplate="{StaticResource MainItemTemplate}" ItemsSource="{Binding Path=Categories}" />
    </Grid>
</UserControl>