How to reset multi selected option in list box and check box also?

Hi Friends..
One form I have design,In which list box and check box is available.we are able to select some item from that box.I have one command button called "Reset".I wanted to do that when I click on reset button all the selected item should be dis-select.
How to do that in access 2003 .Any one please guide me.

Thanks

To reset an option frame you can use
Me.Frame1 = ""