Bug 153038 NPE when delete master page content in old report design.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/editparts/ListEditPart.java
{
		if ( isActive( ) )
		{
			this.getViewer( ).setCursor( null );
		}
		super.eraseTargetFeedback( request );
	}
	protected void addChildVisual( EditPart part, int index )
	{
		
		
		this.getViewer( ).setCursor( null );
		super.addChildVisual( part, index );
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.designer.internal.ui.editors.schematic.editparts.ReportElementEditPart#isinterest(java.lang.Object)
	 */
	public boolean isinterest( Object model )
	{
		if (model instanceof ListGroupHandle)
		{
			if (getModelAdapter( ).isChildren((DesignElementHandle )model))
			{
				return true;
			}
		}
		return super.isinterest( model ) ;
	}
}