Hi Joe Hakooz,
To accomplish this you should have strictly defined base page and user control classes in the App_Code
folder that will be inherited by the specific user controls and the page. The class for the treeview holder user control can expose the RadTreeview
reference by a property and the editor holder user control will get a reference to it by casting its Page
property to the exact page type.
Having the page constructed this way is not recommended, as the controls become too tightly coupled. Would you instead consider creating a third user control that will have a reference to both the user controls and will control them?
the Telerik team