Occurs when a node is selected in the TreeView control.
If we assign any URLs to the NavigateUrl propery of the TreeNode, it will render as a <a> tag, it will not do postback, so it will not file the event;
If we do not assign any URLs to the NavigateUrl propery of the TreeNode, it will render as a short JavaScript which used to postback.
So I think maybe you have assign URLs to the NavigateUrl propery of the TreeNode.
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.treeview.selectednodechanged.aspx
http://forums.asp.net/t/1361178.aspx/1
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