Is it combobox or listbox?

>thisform.mylistbox99.SetFocus=.t. from a cmdbutton
>the combo is enabled, style and readonly properties I can't tell, I don't see those properties listed.
>
>>>I am getting readonly error message when I attempt to make a combobox have the focus. Is there a way? Thanks
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>>What command are you using and where to set focus to the combobox? What're the values of Enabled, Redadonly and Style properties of combo?