tabset auto height adjustment based on content pane height

I am using smartgwt 4.0 free version.I have a tab set with 4 different tab.
Each tab have a form and a drop down.Based on the drop down selection the number of components on the form changes.When less components are visible on the form I see a huge white space below submit button.

How can I auto adjust the height of Tabset based on the height of the form to remove this extra space in bottom of tabset.

I have tried this but nothing happened

tabSet.setOverflow(Overflow.VISIBLE);
tabSet.setPaneContainerOverflow(Overflow.VISIBLE);