Naomi and Tamar:
Todah Rabah! Since this is used in a parent class, I am hoping that the Combobox will notice on its own if its ListCount has changed. In the Requery method, I put
This.Enabled = (This.ListCount > 1)

I put a Debugger Breakpoint on the line. When I tested it by changing the Value in Combobox1, which changed the Value of Combobox2 (Combobox1's RowSource is the parent table of Combobox2's RowSource), neither one fired its Requery method.

Any ideas on why it doesn't fire?

Jerry