It's probably doable, but with my n00b skills I couldn't figure this out yet.
When I try to "Make Into Part" on the RadMaskedTextBox, Expression Blend complains that it's not a TextBox.
How can I make it to use it as a proper control part? Can I "typecast" somehow in XAML?
Thanks in advance for all help!
The first answer is correct. While you can insert a RadMaskedTextBox into an autocomplete template (steps below), internally it wants to see a TextBox class to hook up the text changed event. The Telerik RadMaskedTextBox derives from Control instead, so the event is not hooked up.
The solution would be to use another Masked edit box that does derive from TextBox and insert it using the above steps