[IronPython] Answers not added to the thread

[Stute, Detlef ALRT/EEG4]

Hi all,
A short non IronPython question.
What must be the subject line of an answer to be integrated into the message thread?
My answers to any questions are not added to the thread, the occur as a new independent message.

Mit freundlichen Grüßen/ kind regards/ Cordiali Saluti
SEATEC GmbH 
Detlef Stute
www.seatec-gmbh.com