10.3 Member Constraints

Silverlight imposes the following special constraint on UserControl. The following should be considered an additional constraint for section 4.3.2 of [MS-XAML].

4.3.2.S1.A Silverlight UserControl MUST specify the x:Class directive if it contains content, and/or sets its Content member. (Note: The x:Class directive requirement effectively dictates that the UserControl be at the root of the document.)