You may not realize it, but if you have the webOS SDK installed on your system, you’ve got the source for the Mojo framework there right on your machine available for reading. On Windows, we install it in the “share/refcode/webos-framework” folder under the location where the SDK lives (usually c:\Program Files\Palm\SDK), next to the code samples and webOS application source. On Mac, it’s in /opt/PalmSDK/share/refcode/framework.
So, I encourage you to dive in and explore the framework source, along with the source for many of our Palm apps, which you’ll also find installed with the SDK. A quick note on licensing: use of the framework and app source code is governed by the terms of the SDK license agreement, which is permissive but not open-source. You’re free to explore the code, learn from it, and even reuse it, as long as you’re working on webOS applications—the license currently does not allow use outside of webOS.