DropDown Control in Silverlight

<UserControl x:Class="DropDown.Page"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:liquid="clr-namespace:Liquid;assembly=Liquid"
xmlns:liquidTreeView="clr-namespace:Liquid;assembly=Liquid.TreeView"
Width="400" Height="300">
Grid x:Name="LayoutRoot" Background="White">
<liquid:DropDown x:Name="dropDown" Width="100" Height="23" SelectedItemContent="Pick...">
<liquidTreeView:Tree x:Name="treeView" Width="150" Height="150" EnableLines="True" SelectionChanged="Tree_SelectionChanged">
<liquidTreeView:Node Title="Root Node">
<
<liquidTreeView:Node Title="Item 2" />
<liquidTreeView:Node Title="Item 3" />
<liquidTreeView:Node Title="Item 4" />
<liquidTreeView:Node Title="Item 5" />
</liquidTreeView:Node>
</liquidTreeView:Tree>
</liquid:DropDown>
</Grid>
</UserControl>