WPF Designer “Could not create an instance of type”

Question

In my UI XAML I\'m essentially inheriting from a class \"BaseView\" that contains functionality common to several forms, however this is preventing the designer from display

Answer 1

Another cause. My control class had a static field that was initialized from resources, like this:

 static Color s_ImgColor = (Color)TheApp.Resources["PhoneForegroundColor"];

That would throw a null reference exception in XAML editor, since the resources are not available in design mode. Were it not a color resource (say, a brush), this won't be a problem, but a typecast to value type throws up on a null reference.