Bug 135790 ClassCastException in RowData.
ClassCastException is thrown in RowData line 81(IBaseExpression expr = ( IBaseExpression ) valueExpressions.get( index - 1 );).
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
ListBandDesign footer = createListBand( handle.getFooter( ) );
		listGroup.setFooter( footer );
		boolean hideDetail = handle.hideDetail( );
		listGroup.setHideDetail( hideDetail );
		currentElement = listGroup;
	}
	/**
	 * create a table group using the DE's TableGroup.
	 * 
	 * @param handle
	 *            De's table group
	 * @return engine's table group
	 */
	public void visitTableGroup( TableGroupHandle handle )
	{
		TableGroupDesign tableGroup = new TableGroupDesign( );
		setupGroup( tableGroup, handle );
		TableBandDesign header = createTableBand( handle.getHeader( ) );
		tableGroup.setHeader( header );
		
		String toc = handle.getTocExpression( );
		if ( null != toc && !"".equals( toc.trim( ) ) ) 
		{
			if ( header.getRowCount( ) > 0 )
			{
				RowDesign row = header.getRow( 0 );
				row.setTOC( createExpression( toc ) );
			}
		}
		TableBandDesign footer = createTableBand( handle.getFooter( ) );