Thank you for contacting us.
Straight to the questions:
1. You can define the custom theme as a style also. You can put it in a merged dictionary or in the same page as the Docking control.
2. Yes, you can just change the required parts, but in that case you will have to put the theme as a Application resource.
3. Once you become a customer you will receive the source code of our controls. When you build it, it will generate all xaml code for all themes.
Hope this information helps. If you have further questions please let us know.
All the best,
the Telerik team
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