Hi Mirang,
In general the scenario that you need to achieve is not officially supported, however, you could try using the jQuery - Templates as exemplified in
this demo. Furthermore you can take a look at the following forum posts where a similar scenario is being described:
http://www.telerik.com/community/forums/aspnet-ajax/treeview/adding-a-template-to-a-node-client-side.aspx
Regards,
Kate
the Telerik team
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