You need to create your button in the createChildren method, then position it in the updateDisplayList method.
I've had issues with PNG's not showing up in our app. Every once in a while, all our PNG's disappear. To test whether you're code suffers the same problem, try using a test image that's a GIF or other format.
If it works then you're having the same issue I've run into dozens of times.
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.