tweaking command 'optionlabel' on switchboard

I run A2K and created a s'board using the 'wizard'. The 3rd option label from
the top of the s'board is hooked up to a 'macro1' which proceeds to run some
queries that update a couple of tables in the app. I've got a msbox at the
top of the macro that tells the user they are about to manipulate the tables
and I also turned off the warnings that pop up when each query runs to make
the thing run a little more 'professionally' but I would like to give user a
chance to back out of the command of this optionlabel in the event it was not
deliberately chosen. so, here's the thing -- as I see it, what I would have
the thing do is pop up a message that let's the user say they want or don't
want to proceed immediately after clicking the 3rd optionlabel, e.g. 'Are you
sure you wanna continue?' YES or CANCEL.