Hi,
You would find x:Type in Silverlight 5 version(not sure which version you are using)
which is nothing but implicitly binding your bindable controls with a class of specified type.
If you are using older versions then add an entry in
<usercontrol.resources><br />
<yourclass:yourclass x:key="yourKey" xmlns:x="#unknown" xmlns:yourclass="#unknown" /><br />
</usercontrol.resources>
and give Binding to your DataTemplate by giving the StaticResource with the x:Key.
Hope this helps.
Happy Coding!!