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
{
	protected AbstractContent content;
	private ExecutionContext context;
	public ReportElementInstance( AbstractContent content,
			ExecutionContext context )
	{
		this.content = content;
		this.context = context;
	}
	protected ReportElementInstance( ExecutionContext context )
	{
		this.context = context;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.IReportInstance#getStyle()
	 */