Bug: Calendar and Touchkit Theme

I have started to use Vaadin Touchkit recently. It looks very nice and fun but I have a problem.
I created touchkit app from the maven archetype like on website of vaadin.

I attached two screenshot.
In one I am using annotation @Theme(“touchkit”) - which is ugly, in one - I am not using this annotation in file MyProjectTouchKitUI.java

I understood that I need to create new WidgetSet and not optimize Calendar. I found the CalendarConnector class when I tried to watch how they are creating new widgetset in Parking Demo. I tried to play with this class but I am still cannot understand how it did this magic of changing calendar to this buggy thing.