I have created a usercontrol which accept type of enum and assign the values of that enum to a ComboBox control in that usercontrol. Very Simple. I am using this user control in DataTemplates. Problem comes when there comes nested type. I assign that using this notation
EnumType="{x:Type myNamespace:ParentType + NestedType}"
It works fine at runtime. but at design time it throws error saying
Could not create an instance of type 'TypeExtension'
Why? Due to this I am not able to see my window at design time. Any help?