Bug 210507 Enhance Report engine to support multiple view
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/EngineIRReader.java
count = grid.getRowCount( );
			for ( int i = 0; i < count; i++ )
			{
				ReportItemDesign item = grid.getRow( i );
				item.accept( this, value );
			}
			return value;
		}
		public Object visitGroup( GroupDesign group, Object value )
		{
			linkReportElement( group );
			BandDesign header = group.getHeader( );
			if ( header != null )
			{
				header.accept( this, value );
			}
			BandDesign footer = group.getFooter( );
			if ( footer != null )
			{
				footer.accept( this, value );
			}
			return value;
		}
		public Object visitListing( ListingDesign listing, Object value )
		{
			linkReportElement( listing );
			BandDesign header = listing.getHeader( );
			if ( header != null )
			{
				header.accept( this, value );