VB.Net Email problem

Question

In an Access 2007 application, I can do the following command, which will automatically compose a new email in my Lotus Notes application (which is running at the time).  The Lotus Notes new memo window will be displayed and I can add contacts, attach files and send the mail.

    DoCmd.SendObject acSendReport,
                         strReport,
                         acFormatPDF,
                         strTo,
                         strCc,
                         strBcc,
                         strSubject,
                         strMessage,
                         blnEdit

In a VB.net 2008 application I do a similar operation as follows:

        Dim oAccess As Access.Application
        oAccess = New Access.ApplicationClass()
            oAccess.DoCmd.SendObject(Access.AcSendObjectType.acSendReport,
            strReportFileName,
            strFormat,
            strTo,
            strCc,
            strBcc,
            strSubject,
            strMessage)

I have all my references defined correctly as far as I can tell, but in my VB app when I do the above SendObject command it fails with the message:

     The command or action "SendObject" isn't available now.

This is confusing because the same command works fine when called from Access.

Does anyone have any ideas on why I can't do this command in VB?

Tim