How to activate a tool via vba in PPx4?????

 Hello all.

I have been trying to figure out how to activate the magic wand tool inPPX4 via VBA or any other tool for that matter. My goal is to create a selection of transparent background. Ive poked around in the VBA reference for PPX4 but its not too clear to me where to find. Would anyone share this knowledge with me please.

Thanks in advance,