When you click on a tab in a TabStrip, the expand animation shrinks the content area's height to zero, then expands it to the height of the new tab. This isn't bad, but gives a "bounce" effect to the control, which can be offputting (I've had complaints about it from users).

If would be nice if you could animate it from its current height directly to the new height, without shrinking to zero in between. That would be a much nicer effect.