I have a program in Excel 2000. It works well. Recently I upgraded to Excel
2003 then the combo box does not work well any more. The problem is when I
click on the down arrow to select a name in combo box, it just works for the
first time, the second time it shows the error message like this:

"The cell or chart you are trying to change is protected ad therefore
read-only. To modify a protected cell or chart, first remove protection
using the UnProtect Sheet command (Tools menu, Protection submenu). You may
be prompted for a password".

The cellink is locked. If I unlock the celllink, it works well, but that
cell must be locked.

Please let me know as soon as possible by reply to my email:

Thank you.
Tvnguye