title: How to correctly inherit from a usercontrol defined in XAML in Silverlight
body: <p>If I have a usercontrol (in Silverlight) that I've written, that uses XAML to define it's appearance, how can I make a customised version of it?</p>
  
  <p>i.e. I have MyControl.xaml &amp; MyControl.xaml.cs</p>
  
  <p>What do I need to do if I want a "SpecialisedControl" child class? I assume I just make a new code file, then inherit from MyControl. But what if I want to change the appearance of the base class - then what do I do?</p>