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Indeed the described two level DocumetnHost compass is not available in the current version of RadDocking. It is possible to customize the template of the compasses but unfortunately it is not possible to wire those custom templates in such a way to achieve the described docking of RadPane instances. The reasons is because such docking logic is not implemented in the code of the control.
As we see that such feature would be useful to be present in the control we will do our best to implement it in one of out future versions of the control. We logged this feature request in our feedback portal
where you can vote of it and track its status.
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