You cannot.

>
>Based on the following:
>

>THISFORM.ComboBox.RowSourceType = 3
>THISFORM.ComboBox.RowSource = 'SELECT dept_id FROM dept ORDER BY dep_id into cursor cb_source'
>THISFORM.ComboBox.Value = THISFORM.ComboBox.List[1]	
>

>
>How can I make a specific ListItem disabled ?
>
>

>FOR m.i = 1 to THISFORM.ComboBox.ListCount
>   IF THISFORM.ComboBox.ListItem[m.i] = "78"
>       make it disabled ???
>   ENDIF
>ENDFOR
>

>
>TIA