On my first form I only had one data source (Main)
and used the following code to set my file name prior to a save

meetingName = XDocument.DOM.selectSingleNode( "//my:field1" ).text;
meetingDate = XDocument.DOM.selectSingleNode( "//my:field2" ).text;
XDocument.UI.SetSaveAsDialogFileName(meetingDate + " - " +
meetingName);

Very simple...

Now on a new form I've got two data sources, again the field I'm trying
to use is simply a text box on the main form, but I just cannot get the
syntax correct.  Name of the field is "UseCaseName"

I've tried:

docName = XDocument.DOM.selectSingleNode( "//my:UseCaseName" ).text;

I've tried it many different ways but simply cannot reference it, if I
navigate to it using the expression control that field is shown as
"my:UseCaseName"

But everytime I run this I get that the object cannot be found.

Please help, I know it is something ridiculously simple...

Thanks.