Combo_box (1 reply)

This is probably an easy question but I can't seem to find an answer myself.

I have a window to which I pass a parameter (psBoatID). On the window there is a combo_box showing the description of the boats: the stored value is the code for the boat. I want the combo_box to initially show the description for the boat that corresponds to the passed parameter. I just can't find the appropriate syntax.
Thanks
Garry