Hoping that someone could shed some light on how to accomplish the task of submitting a drop down menu selection without having to manually click submit on the toolbar in IWP.

Scripts cannot be triggered by data entry in IWP. You have to click a button, whether on the toolbar or your own button on the layout.

Thanks...I was afraid of that. Do you think it is possible to write a plugin that will accomplish this task?

No. Perhaps your users could be trained to click a button after making their selection. Or you could present your options in a portal, which you could set up so that clicking an item would also submit it.

FileMaker's own Layout dropdown in the IWP Status area works exactly as needed. Too bad there is no way to get something to work the same way within the user part of the application. Maybe FM12?

If it is a fixed list it could be created in a web viewer which would have a JavaScript trigger on selection - read this thread for more info.

FYI if you want a web viewer to have invisible borders in all browsers you need to put a 2 pixel line at each side of the control to cover its' borders. That way the drop-down can blend in with the rest of the layout.