Treeview expand/collapde is not working in server.Treeview last node is not working.

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C#2.0

.NET3.0

C#3.0

C#

ASP

ASP.NET

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I have a treeview that I build programmatically. When running it locally on my SharePoint, I can click the plus button and have the tree node expand. When I deploy the application page to SharePoint, the treeview no longer expands. I have the tree in an updatepanel. Can someone tell me why the tree is not expanding? It worked just by adding an updatepanel in the aspx page. Do I need to add anything else for it to work on the server?
Any solution?