Changing language or partners displays wrong e-mail content

This is only a display problem (new UI) but should get fixed:

1. Create a new document, e.g. an sales order
2. Call the dialog of xtMail Suite one time and leave it again
3. Change the partners of the sales order or change the communication language without saving the changes.
4. Call the dialog of xtMail Suite again -> It still displays the data based on the partners or language of the first call.

When sending the e-mail, always the correct data is used.