Plug-in annotation update while moving art objects

[superpanic]

I'm working on a simple plug-in (C++ both mac/windows) that draw x and + icons as annotations to mark all selected paths start and endpoint. It works fine when selecting art objects.

But while dragging an art object I'm not able to update the annotations, it is only updated after the move is completed. Is it possible to get notification updates while the user is dragging the selected art, to know when to redraw the annotations?

In the image below to the right you can see that the native Illustrator annotations are updated fine and move along with the cursor, but my annotations stay in place, and are updated only when the mouse button is released.

My plug-in is not implemented as a tool, but as a general feature.