WPF vs. Silverlight - Part 1 - Custom Controls Theme

When applying default theme and template to custom controls that you declared in "/Themes/Generic.xaml" it's done differently in Silverlight and WPF:

public class MyControl : Control
{
public MyControl()
{
#if SILVERLIGHT
this.DefaultStyleKey = typeof(MyControl);
#endif
}
static MyControl() {
#if !SILVERLIGHT
DefaultStyleKeyProperty.OverrideMetadata(
typeof(HoverControl),
new FrameworkPropertyMetadata(
typeof(HoverControl)));
#endif
}
}

Also, in the WPF Assembly, you need to register the theme file in AssemblyInfo.cs This is done with the following line of code:

[assembly: ThemeInfo(ResourceDictionaryLocation.None,ResourceDictionaryLocation.SourceAssembly)]

Note: This code is usually added automatically when you create a new WPF project.