Hi Herb Ramos,
Thanks for writing to us and your question.
Actually, the proper way to obtain the treeview client-side instance is using the following syntax:
var tree = <%= radTreeModule.ClientID %>;
var tree = window["<%=radTreeModule.ClientID %>"];
Thus, you will get the client side object and a reference to all its properties and methods exposed at the client-side.
Hope this helps.
the Telerik team