Jabberwock,
Don't know what you mean precisely with a label but select your action
button, rightclick and choose Format AutoShape, on the colors and lines tab,
next to color click on listarrow and choose fill-effect, click on the
picture tab, click on insert picture... You can do that also by using the
paint bucket button on your drawing toolbar.
Hope this will help, if not someone else will jump in and save me from
further harm.
Luc