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/CellInstance.java
*/
	public int getColSpan( )
	{
		return cell.getColSpan( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.ICellInstance#setColSpan(int)
	 */
	public void setColSpan( int colSpan )
	{
		cell.setColSpan( colSpan );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.ICellInstance#getRowSpan()
	 */
	public int getRowSpan( )
	{
		return cell.getColSpan( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.api.script.instance.ICellInstance#setRowSpan(int)
	 */
	public void setRowSpan( int rowSpan )
	{