PyChecker under python's virtualenv

[soltys]

Hi Everybody,
I've been doing some test on pythons' virtualenv and recently I've
decided to run PyChecker. But I'm having some difficulties with importing
modules available only on virtualenv by pychecker. As if it was
trying to use systemwide python.
I've googled about it, and found nothing in this area.
I installed pychecker using python setup.py install
from virtualenv. I looked at pychecker script - it uses correct python.

Any help appreciate,
Soltys