You could customize the ContextMenu to fit your requirements very easy. You can find more information how to achieve this in this help article
As for docking the floating window - if you have its reference, you have to just add it to the group you want to be docked. You could read more about how to manipulate the position of the panes in code behind in this help article
Hope this information helps. Please do not hesitate to contact us again if you have further questions.
the Telerik team
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