Hi! I am designing a form for sales invoice wherein I have a combo box for selecting the salesman, another combo box for selecting the terms and an option group. Whenever the cursor got focus on either of these combo boxes or the option group. My grid for entering items sold will become inaccessible. If I omit entering the combo boxes, the grid is functional. Is there any relation among these objects?

If I delete the combo boxes & option group from the form, the grid is functional.

Help! Thank you in advance.