Finding python modules in rqt plugins?

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I have defined Python modules in setup.py for a package and these modules are found when running Python programs from another package using rosrun. But running

rosrun rqt_gui rqt_gui -s lrs_rqt/rqt_quad.quad.Quad

where I in quad.py have:

from quad.qcon import *

then it does not work. It does not find the qcon. So does it work differently with plugins? And if so how does it work?

I am using groovy and catkin.