Bug 53098 [KeyBindings] KeyBinding service must bind (DEL) key to ActionFactory.DELETE
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
/*		
		final IMutableContextActivationService contextActivationServiceA = ContextActivationServiceFactory.getMutableContextActivationService();
		contextActivationServiceA.setActiveContextIds(new HashSet(Collections.singletonList("A")));
		final IMutableContextActivationService contextActivationServiceB = ContextActivationServiceFactory.getMutableContextActivationService();
		contextActivationServiceB.setActiveContextIds(new HashSet(Collections.singletonList("B")));				
		
		menu.add(new Separator());
		
		menu.add(new Action("Add context A to the workbench") {
			public void run() {
				IWorkbench workbench = PlatformUI.getWorkbench();
				IWorkbenchContextSupport workbenchContextSupport = (IWorkbenchContextSupport) workbench.getContextSupport();
				workbenchContextSupport.getCompoundContextActivationService().addContextActivationService(contextActivationServiceA);
			}
		});
		menu.add(new Action("Remove context A from the workbench") {
			public void run() {
				IWorkbench workbench = PlatformUI.getWorkbench();
				IWorkbenchContextSupport workbenchContextSupport = (IWorkbenchContextSupport) workbench.getContextSupport();
				workbenchContextSupport.getCompoundContextActivationService().removeContextActivationService(contextActivationServiceA);
			}
		});
		
		menu.add(new Action("Add context B to the workbench") {
			public void run() {
				IWorkbench workbench = PlatformUI.getWorkbench();
				IWorkbenchContextSupport workbenchContextSupport = (IWorkbenchContextSupport) workbench.getContextSupport();
				workbenchContextSupport.getCompoundContextActivationService().addContextActivationService(contextActivationServiceB);
			}