"tick all"-check box

I have check boxes, option buttons and other things connected to a (update-via-button) macro. I'd like to create a check box/button that selects all/none of the check boxes in a certain group. My thought was that i link a normal check box to macro which simply ticks or unticks all the check boxes in my group, is it possible to tick/untick a check box from within a macro? Other ideas for solution?

Very simple example workbook attached.
Thanks!