The only "mouse over" response you can set in Filemaker 10 is to set a tool tip on a layout object. This is a literal or calculated text message and won't trigger a script or popup/drop down a menu so I don't see how that will help you.
Thanks Phil. Figures.
I knew about Tooltips (have used them liberally in a couple of solutions such that I didn't have to write any training or usage docs!!! -- it was all embedded into various Tooltips). Still, since the programming mechanism is in there in the C code (so that Tooltips can show up), it would be a nice little add-on at some rev/point to be able to actuate that sort of rollover stuff in FMP. It's not as if this is something new.