Calendar Auto Height

Hi,
I am using a calendar instance in a tabpanel . If I give heigth=400 for the calendar , updates its height, grows/shrinkgs according to its content height.
What I want to do is not give any height to the calendar instance and to make the calendar decide its height according to its content and not show any vertical scroll, because i want my main container to show scrolls.

So far I tried a lot of things, setAutoHeight, setOverflow method but no luck. If I dont give any height than I see only header of the calendar.