I created a very basic tabbed layout with three panels and one choice-control that represents the tab buttons.
For Panel A I applied the following Rule: TabButtons!="PanelA"
Panel B Rule: TabButtons!="PanelB"
But the form creates a lot of blank space at the bottom of the form (Testet in IE11, Firefox, Safari).
I added to each control the standard Nintex CSS classes and also made sure that I have some space between the panels. Is there something else that I'm missing?