The provided sample project from the code library that you mentioned currently has known issues which are mentioned in the thread's comments.
We are aware of the those limitations and have added an feedback item for an improved version of the sample project here
. The current version of the RadDocking control does not provide an built-in feature which could be used in order to achieve the described drag and drop from out side source into the control. By design the control's compasses are encapsulated and manually triggering them is not possible via the public APIs. As we see this part of the control's API could be improved we will discuss it with the development team in order to provide a better and easy to use public API for achieving the discussed scenarios.
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