Instead of DateTime, since DateTime is not nullable, you are setting to the default value of 1/1/0001, rather than null which would result in the please select a date message you are used to.
You aren't connecting DueDateProperty dependency property to your DueDate property. Try this instead.
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.