How to implement a speech bubble custom border in SL with a movable leader?

You don't have to use the Border control. Just create a Path and shove it and the controls in a Canvas tag to be grouped. Then, the Path will be something like the below.

I used same approach in TipBubble control (http://www.youpvp.com/blog/post/TipBubble-Tutorial.aspx). It works well in most cases but breaks down if you combine border and transparent background. To make bubble that works in that particular case you'd have to make it with single path.

Just combine arc and line segments into one path. Or you could try rounded rectangle callout from Blend 4 SDK.

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.