You can't do what you were originally thinking directly. You probably tried and got some compile errors. You can't set a custom property inline in the UserControl's root XAML because the element type is UserControl so the compiler is enforcing property names based on that type, not your custom type.
You could get around this by changing to an Attached Property but that actually changes the meaning of MyDP. Instead you can set a default in the Style for the UserControl and get an additional benefit of being able to override it on any declared instance by just doing what's in your original example. Set this under your UserControl's root element.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.