Problem/Question: SO Question
How do I expose a DependencyProperty
of a component in my user
control to users? There are plenty
of examples of how to expose a normal
property by creating a new dependency
property and binding, but none on how
to expose a read-only property like
FrameworkElement.ActualWidthProperty.
Solution: You need to expose a new Readonly DependencyProperty in your user control, and update it whenever your contained "component"'s ActualWidthProperty gets updated. This requires using DependecyPropertyDescriptor to get notified of changes that occur. SO Solution
