How to start (and stop) an animation by CommandButton code?

Hi,

PowerPoint 2013:

Is it possible to start and stop the animation of a shape by CommanButton code?
I've a presentation with 1 slide and 1 shape on it. There is an animation added to the shape (blinking).
It's working.
Now I want to start the animation by vba, clicking on a CommandButton.
How is the code for that?
Stopping functionality would be the next step.

Thanks for help
Hajo