submitForm on master page: objects vanish

I have the identical code (see below) in the click-event of two buttons: one on the master page, the other on the text page.

The code on the text page works fine.

The code on the master page produces a "Form1 is undefined" error. The cause for the trouble is clearly the submitForm() - without it the presence change works perfectly.

It appears that the submitForm() triggered from master page events destroys the internal object structure - the whole form is not found any more by the code.

Do you have any idea how to prevent this?

Has anyone else observed this problem?

I have an example form at hand if anyone is interested.

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Form1.myPage.mySubform.presence = "hidden";

sAddress = "baehr@paperless-process.de";

sSubject = "Test eMail";

sBody    = "Please see my empty PDF!";

sType    = "PDF";

sendPDF(sAddress, sSubject, sBody, sType);

Form1.myPage.mySubform.presence = "visible";

//#################################################################

function sendPDF(sAddress, sSubject, sBody, sType) {

    // Purpose:

    //      Sends the PDF form as an eMail.

    // Parameters:

    //      sAddress    a correct eMail address

    //      sSubject    the eMail's subject. May contain umlauts etc.

    //      sBody       the eMail body as a string. May contain umlauts etc.

    //      sType       either "XML" or "PDF"

    // Result:

    //      -

    // Prerequisites:

    //      -

    //    

    // Author:

    //      27.04.15 Ulrich Bähr (www.paperless-process.de):

    var currentDoc;

    if (typeof(xfa) == "object")

        currentDoc = event.target;

    else

        currentDoc = this;

    var sURL = "mailto:" + sAddress + "?subject=" + sSubject + "&body=" + sBody;

    currentDoc.submitForm({

        cURL:sURL,

        cSubmitAs:sType,

        cCharset:"utf-8"

    });

} // sendPDF()

//#################################################################