skinParts() on custom subclass of Scroller does not contain parts from SDK parent class

Steps to reproduce:
1. import project into FB
2. run project under debug mode
3. look at the console

Actual Results:
The trace shows only the zoomReticle parts and not the parent parts

Expected Results:
The trace should show horizontalScrollBar & verticalScrollBar parent parts in addition to zoomReticle

Workaround (if any):
Don't subclass Scroller--make your own Scroller component instead.

Tested on Build 10000