This post seems to be a duplicate of one of your tickets. I have already answered your questions in the other thread. I am copying the answer also here.
Thank you for the provided code snippet. Looking at the code snippet, a custom style is set to the TrackBallInfoStyle and the Template property is overridden by an empty ControlTemplate. I am assuming that this could be the reason behind why the TrackBall does not appear. I have also double check this in a sample project. I am attaching this project so you can check if I am missing something from your implementation.
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