Skinning the CS3 Slider Component

I am trying to do what i thought would be VERY easy and skin the slider. When i change the graphics for the SliderThumb clips however, my new shape is renders out stretched.
It seems that the component is squishing whatever i draw, into a 20x20px square clip. Is this normal? If so WHY!

Exampoe of output (it is squished… trust me)
http://www.touchmypixel.com/tmp/slider/slider.html

Code
http://www.touchmypixel.com/tmp/slider/slider.fla

Any ideas ?