sort dropdown field, sharepoint 2007

Question

I have a list form in sharepoint that contains lookup dropdown fields. I'd like to sort the data within the dropdown to descending. Viewing the form code within sharepoint designer, is there anyway to include code in the XPath expression to sort the data?

<SharePoint:FormField runat="server" id="ff4{$Pos}" ControlMode="Edit" FieldName="dateTEST" __designer:bind="{ddwrt:DataBind('u',concat('ff4',$Pos),'Value','ValueChanged','ID',ddwrt:EscapeDelims(string(@ID)),'@dateTEST')}"/>