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/RowInstance.java
{
	private RowContent row;
	private IRowData data;
	public RowInstance( RowContent row, IRowData data, ExecutionContext context )
	{
		super( row, context );
		this.data = data;
		this.row = ( RowContent ) content;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.IRowInstance#getBookmarkValue()
	 */
	public String getBookmarkValue( )
	{
		return row.getBookmark( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.IRowInstance#setBookmark(java.lang.String)
	 */