ComboBox Styles

Does any one know how to modify the combobox styles dynamically, lets say from CBS_DROPDOWN to CBS_DROPDOWNLIST

I want to allow some people to be able to edit something in the combobox while others should only be allowed to select from the list.

many thanxs

Try with GetWindowLong() to get the current styles, then modify the one you want, and then set them with SetWindowLong()