Hi Tomas,
After you add NCommandBarsManager on the form you first need to add NMenuBar or NDockingToolbar where the commands will reside.
You can do that by clicking on the smart tag (the small arrow at the right top corner of the control) and then clicking on Show Editor link or just click on the Show Editor link on the bottom of the NCommandBarsManager Property grid.
Then click on New... button and add tool bar, menu bar or both.
After that you can add command ether by the smart tag on each menubar or toolbar or from the Command property in Property grid.
I hope this helps.
Best Regards,
Nevron Support Team