Force a Selection in Popmenu by entry number

Hi,

I have a folder with sample ids and multiple images per sample.I have a simple viewer where the user selects an item, sample id, from popmenu1 and that creates a new list, images of that sample, for popmenu2.  I can get it to refresh using controlupdate all well and good.  The tweak I would like:  When the popupmenu1 selects an item the viewer will get the first image of the list for popmenu2.  That all works.

Now the challenge, if before selcting a new sample the popmenu2 was on entry 2, when the system updates the control for popmen2, entry 2 is still selected.  If the users doesn't select a new items from popmenu2 he is presented with the wrong image id.  Is there a way when updating the control of popmenu2, I can force it to go to entry 1.

Controlinfo shows the popup entry number so it is in there somewhere.

Clear as mud?

Andy