[Regression] NPE when setting RTL Orientation.

This is a regression introduced from 8u20 b15. (hudson build 8u20 #37)
If a Control's node orientation is set to RTL, NPE is reported at runtime. This doesn't happen to all the Controls. I can't figure out how many Controls have the problem, but ColorPicker is an example.

The steps to reproduce:
1. create a ColorPicker and set its node orientation to RTL,
2. open the Palette then click "Custom Color..."
The NPE appears and the application hangs. Please find attached error-log.txt.