Cannot insert Activex boxes

[Tony Mc]

I have a spreadsheet that has a number of list boxes which
when I try to select from them won't respond. It's like
they don't exist.

I can go into design mode and access them.

If I try to add any of the items from the control toolbox
(eg combo box, etc) I get the message "Cannot Insert
Object"

Can anyone help?

Thanks,

Tony