Bug 55604 [implementation] JavaOutlinePage should dispose CustomFiltersActionGroup
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaOutlinePage.java
return new String[] { JavaUI.ID_PACKAGES };
				}
			};
		}
		if (key == IShowInTarget.class) {
			return getShowInTarget();
		}
		return null;
	}
	/**
	 * Convenience method to add the action installed under the given actionID to the
	 * specified group of the menu.
	 */
	protected void addAction(IMenuManager menu, String group, String actionID) {
		IAction action= getAction(actionID);
		if (action != null) {
			if (action instanceof IUpdate)
				((IUpdate) action).update();
				
			if (action.isEnabled()) {
		 		IMenuManager subMenu= menu.findMenuUsingPath(group);
		 		if (subMenu != null)
		 			subMenu.add(action);
		 		else
		 			menu.appendToGroup(group, action);
			}
		}
	}
	 
	protected void contextMenuAboutToShow(IMenuManager menu) {