I recommend that you use IE for Silverlight development. See also this answer .
First of all, could you please check is your . Xap file also included into source control? It should not be included..., no need IMHO.
Most likely your xap file is set to read only. Go to that file location and make ClientBin folder not read only if is.
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.