Bug 146208 ActionBarContributor Enhancement
Use MultiPageEditorActionBarContributor instead of EditorActionBarContributor to support more multi-page feature.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/DesignerActionBarContributor.java
editGroupMenu = new MenuManager( Messages.getString( "DesignerActionBarContributor.menu.element-EditGroup" ) ); 
		editGroupMenu.add( NoneAction.getInstance( ) );
		editGroupMenu.addMenuListener( new IMenuListener( ) {
			public void menuAboutToShow( IMenuManager manager )
			{
				updateDynamicItems( EditGroupMenuAction.ID, manager );
			}
		} );
		newMenu.add( editGroupMenu );
		newMenu.add( new Separator( ) );
		contributeStyleMenu( newMenu );
		newMenu.addMenuListener( new IMenuListener( ) {
			public void menuAboutToShow( IMenuManager manager )
			{
				IContributionItem addGroupMenu = manager.findUsingPath( AddGroupAction.ID );
				IContributionItem insertGroupMenus = manager.findUsingPath( InsertGroupMenuAction.ID );		
				if(addGroupMenu == null || insertGroupMenus == null)
				{
					return;
				}
				RetargetAction action = (RetargetAction) getAction( AddGroupAction.ID );
				if ( action != null
						&& action.getActionHandler( ) instanceof AddGroupAction )
				{
					if(action.getActionHandler( ).isEnabled( ))
					{						
						addGroupMenu.setVisible( true );
						insertGroupMenus.setVisible( false );
					}else
					{