exposing hsb bindable property, g input layout fix

1. By disabling hsb controls, height of AdvancedColorPickerDropDown can be accommodated in even smaller areas.
2. Also fix of 'G' input field's horizontal positioning.

![changes](https://f.cloud.github.com/assets/815875/2122323/a0336ac2-920a-11e3-8ad9-310905c51d53.png)