“Draw Filled”:

This button operates exactly like “Draw Frame” except it draws the splat filled with a random RGB color and a black frame.  If you click this button and then click “Draw Frame” the frame will be overdrawn with a random RGB color.

If you have a series of overlapping, filled splats drawn, and you click the Stat’s Box, the filling will remain and only the frames will be overdrawn in random RGB.  if you click the grow box, all filling will be erased and all frames will be redrawn in random RGB.