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/executor/ListingElementExecutor.java
{
		public Object visitFreeFormItem( FreeFormItemDesign container,
				Object value )
		{
			for ( int i = 0; i < container.getItemCount( ); i++ )
			{
				container.getItem( i ).accept( this, value );
			}
			return value;
		}
		public Object visitListItem( ListItemDesign list, Object value )
		{
			value = clearListBand( list.getHeader( ), value );
			for ( int i = 0; i < list.getGroupCount( ); i++ )
			{
				ListGroupDesign group = list.getGroup( i );
				value = clearListBand( group.getHeader( ), value );
				value = clearListBand( group.getFooter( ), value );