Prevent window moving to current workspace XFCE4

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http://stackoverflow.com – I have a really annoying problem with XFCE4. My window manager for some reason puts new windows in current workspace. Example, I start Eclipse in workspace 2, switch to Firefox on workspace 1, and 5 secs later Eclipse pop up on workspace 1. This is very annoying. I tried google but found no solution. If this is truly unsolvable can you recommend me some other window managers that behave as I wish. (HowTos)