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
/**Add the processor
	 * @param processor
	 */
	public void addModelEventProcessor( IModelEventProcessor processor )
	{
		if ( !listenerList.contains( processor ) )
		{
			listenerList.add( processor );
		}
	}
	/**Remove the processor.
	 * @param processor
	 */
	public void removeModelEventProcessor( IModelEventProcessor processor )
	{
		listenerList.remove( processor );
	}
	/**
	 * Dispose
	 */
	public void dispose( )
	{
		listenerList.clear( );
		if (root instanceof DesignElementHandle)
		{
			visitor.removeListener( (DesignElementHandle)root );
		}
		root = null;
		visitor = null;
	}