[ Type code = ||r ] These are similar to checkboxes, but considerably trickier to use because they are must be grouped somehow since only one within a group can be set at one time. If there is only one set of radio buttons on the screen, then these form a single group. Otherwise you must use AUI_CONTROL to create a group box to contain the radio buttons. Note that because of these complexities, it is usually much easier to use a combo box to present a choice of mutually-exclusive options. (Combo boxes are easy to implement – just specify |G and use the setdef parameter to list the choices.) See Radio button Control.