Bug 157805 [Workbench] Add Hide Toolbars to the Window menu
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
public boolean isEnabled() {
         return false;
         }
         };
         
         IHandler handlerB = new IHandler() {
         public void execute() {
         }
         
         public void execute(Event event) {
         }
         
         public boolean isEnabled() {
         return false;
         }
         };		
         
         final IMutableCommandHandlerService commandHandlerServiceA = CommandHandlerServiceFactory.getMutableCommandHandlerService();
         commandHandlerServiceA.setHandlersByCommandId(new HashMap(Collections.singletonMap("command", handlerA)));
         final IMutableCommandHandlerService commandHandlerServiceB = CommandHandlerServiceFactory.getMutableCommandHandlerService();
         commandHandlerServiceB.setHandlersByCommandId(new HashMap(Collections.singletonMap("command", handlerB)));				
         
         menu.add(new Separator());
         
         menu.add(new Action("Add handler A to the workbench") {
         public void run() {
         IWorkbench workbench = PlatformUI.getWorkbench();
         IWorkbenchCommandSupport workbenchCommandSupport = (IWorkbenchCommandSupport) workbench.getCommandSupport();
         workbenchCommandSupport.getCompoundCommandHandlerService().addCommandHandlerService(commandHandlerServiceA);
         }