[TIMOB-5889] iOS: KitchenSink - Changing a basic slider has an intermediate animation

1) In KitchenSink, navigate to Controls -> Slider -> Basic 2) Press 'Change Basic Slider' Expected results: Basic slider becomes similar to the custom slider without any intermediate animations/sliders. Actual results: There briefly appears a slider similar in size to the basic sliders original size, but with a skull instead of a button. The slider then becomes longer and the skull moves back into its expected position. Notes: For convenience, I uploaded a video of this occurring: http://vimeo.com/31224414 This is reproducible in 1.7.3 and SDK 1.7.4.v20111025165811 EDIT: Changed to 1.8.0