Desktop switching in KDE when I start an application in another acitivity

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http://unix.stackexchange.com – Hy! I have an application which is forced upon start to Desktop 2 and acitivity B. If I am currently in desktop 1 of activity A and start this program, it opens in the rigth place, but my active desktop is changed to desktop 2 of activit A. Is there some way to disable this? (HowTos)