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 IReportElementInstance getParent( )
	{
		return ElementUtil.getInstance( content.getParent( ), context );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.IReportInstance#getHorizontalPosition()
	 */
	public String getHorizontalPosition( )
	{
		return content.getX( ).toString( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.IReportInstance#setHorizontalPosition(java.lang.String)
	 */
	public void setHorizontalPosition( String position )
	{
		content.setX( DimensionType.parserUnit( position ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.IReportInstance#getVerticalPosition()
	 */
	public String getVerticalPosition( )
	{