How do I clear a form?

I mean if I have a form that has a command box and a couple of input text boxes.

When they Click a certain command box it will start running a fairly large report.

I want to clear the form and frequently during the progress of my report application I will put a message on the screen with ? Such as ? "Now Sorting data"


If I use thisform.cls it clears text and graphices, but does NOT clear command boxes.