drawing a triangle on a toolbarbutton

Hello all,

I am trying to draw a triangle on a toolbarbutton to simulate a drop
down button without having the extra button beside my drop downbutton.
I was successfully able to draw the triangle by overrriding the onpain
event for the tool bar. that only problem is when I click on the button
( a context menu shows up) the triangle disappears. I also overrided
mouse up, down, hover, leave events and made them to call
me.invalidate.

Any help is appreciated.