>>Thanks for your help Jim, the form is instantiating fine now.
>>I still have one other problem with these combo boxes. I have four combo boxes on this container - three of them don't respond to mouse clicks and the remaining one works fine. They are set up in the same way ie rowsource type is set to Alias and rowsource to the table name. I haven't changed any of the other settings. They all respond normally to keyboard control.
>>Any ideas?
>>
>John,
>
>You can use event tracking in teh debugger to find out what events are firing when you click the mouse on one of the illbehaed combos. This will certainly give you a clue to what is happening. The events I would track are MouseDown, MouseUp, and Click.

Jim,

You may be interested to know that the reason I couldn't use the mouse with certain combos was that that particular container was partly overlaid by another container on the form.

Thanks again for your responses.

John Thomason.