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OnClientLoad

The OnClientLoad client-side event occurs when the RadDropDownTree is first loaded and fully initialized on the client.
The event handler receives a single parameter: a reference to the client-side dropdowntree object.
You can use this event to perform your own initialization to the dropdowntree when it is loaded, or to save a reference to the dropdowntree in a global variable for reference from within your client-side code.