I will go straight to your questions.
1. You could create a custom Shape if there isn't a Shape you desired in the already build-in. Please, check the following article from our help documentation for some more detailed information:
2. You could use RadDiagram inside RadDocking without any concerns. I have created a sample project that demonstrates that. Please, check it and let us know if that is what you are looking for.
Also, indeed if you have any additional questions concerning RadDiagram
it is better to be published in the Diagram forum - thus if some other member of the community has a similar question it will be easier for him to find it. The example also demonstrates that RadDiagramToolbox
is used as expected on our side.
Hopes this helps.
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