As of 1.0M9 update-1, the MobiOne Design Center does not yet provide color property editing of navbars. The current method I use is to revise the navigationBar.png image found in the res/images/ directory of your exported design. If you selected the (>) greeen Run button in the Designer to test your design in the Test Center then looking for the generated HTML code in a subdirectory in the same location as where you saved your design file (.mobi).
We are evaluating some HTML code-gen enhancements to make it much easier to modify much of the styling of a generated webapp.
Warning! – if you do modify any generated resources they may be overwritten by MobiOne. We don’t yet have the code-merge system in place to support preservation of user managed units of code. That will be coming soon.
Wayne
Genuitec Mobile Team