Openni skeleton tracker does not post transforms

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Hi,

i am trying to use the openni skeleton tracker with kinect. We are starting openni with default parameters and openni_tracker:

$ roslaunch openni openni.launch
$ rosrun openni_tracker openni_tracker

And it basically seems to detect the human and the PSI-pose, but i cannot get any visualization in RVIZ. As far as i understand the code, the skeleton-transforms should be posted via tf? Also i cannot find the "Prime Sense User Tracker Viewer" anywhere...