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/api/script/instance/IReportElementInstance.java
{
	/** Get the style of this element
	 * 
	 */
	IScriptStyle getStyle( );
	/**
	 * Get the horizontal position
	 */
	String getHorizontalPosition( );
	/**
	 * Set the horizontal position
	 */
	void setHorizontalPosition( String position );
	/**
	 * Get the vertical position
	 */
	String getVerticalPosition( );
	/**
	 * Set the vertical position
	 */
	void setVerticalPosition( String position );
	/**
	 * Get the width of the element
	 * 
	 */
	String getWidth( );
	/**
	 * Set the width of the element
	 * 
	 */