/**
* Informs all registerListeners that a {@link Dockable} has been unregistered.
*
* @param dockable the unregistered Dockable
*/
protected void fireDockableUnregistered(Dockable dockable) {
for (DockRegisterListener listener : listDockRegisterListeners())
listener.dockableUnregistered(controller, dockable);
}
