Brush cursor in plugin

Hi! I've been tinkering around with the SDK and I've gotten to a point where I'm trying to recreate the brush functionality in a plugin (as in draw/erase things)  but I can't seem to find a way to make the plugin draw the brush cursor around, I know I can set the cursor and that there's an adjust cursor event but that just makes the cursor flicker a whole bunch.

TL;DR trying to make a brush, can't make the cursor (circle around pointer with size adjustment)