* Set the control component and listener semantics for gain meter Control
* @param c An AbstractButton
* @param l An ActionListener that implements Control semantics.
*/
public void setGainMeterButton(AbstractButton c, ActionListener l) {
ActionListenerControl control =
(ActionListenerControl)getControl(StandardControls.GAINMETER_CONTROL);
replaceControlComponent(control.getControlComponent(), c);
control.setComponentAndListener(c, l);
}