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/script/internal/instance/ReportElementInstance.java
public IScriptStyle getStyle( )
	{
		return new StyleInstance( content.getStyle( ) );
	}
	public Object getNamedExpressionValue( String name )
	{
		Object generatedBy = content.getGenerateBy( );
		if ( generatedBy instanceof ReportElementDesign )
		{
			ReportElementDesign design = ( ReportElementDesign ) generatedBy;
			Map m = design.getNamedExpressions( );
			String expr = ( String ) m.get( name );
			if ( expr == null )
				return null;
			context.newScope( this );
			try
			{
				return context.evaluate( expr );
			} finally
			{
				context.exitScope( );
			}
		}
		return null;
	}
	public Object getUserPropertyValue( String name )
	{
		Object generatedBy = content.getGenerateBy( );
		if ( generatedBy instanceof ReportElementDesign )
		{