Bug 152412 [Smoke]Insert,delete a master page, can not take effect
Insert,delete a master page, can not take effect Steps: 1.new a report 2.open outline view, insert a master page or delete a master page Actual Results 1.Can not take effect.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/parts/event/ModelEventManager.java
case ActivityStackEvent.ROLL_BACK :
				clearEvent( );
				break;
			default :
				break;
		}
	}
	/**
	 * Post the model event, when the model trans commit.
	 */
	protected void postModelEvent( )
	{
		
		
		try
		{
			isPost = true;
			int size = listenerList.size( );
			for ( int i = 0; i < size; i++ )
			{
				IModelEventProcessor processor = (IModelEventProcessor) listenerList.get( i );
				processor.postElementEvent( );
			}
		}
		catch(Exception e)
		{
			ExceptionHandler.handle( e );
		}
		finally
		{