how to attach javascript function to treeview node in runtime

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Javascript

treeview

I have a treeview in which, I need to add node runtime with javascript function embeded to it something like this

If trvProduct.CheckedNodes.Count = 0 Then
Dim Newnode As TreeNode = New TreeNode()
Newnode.Text = "javascript:<b id='b1' oncontextmenu="return showmenuie5(event)" > " + prdcode + "--" + prddesc + "--Qty=" + Qty.ToString() + "javascript:</b>"
Newnode.PopulateOnDemand = True
Newnode.SelectAction = TreeNodeSelectAction.Expand
Newnode.ExpandAll()
trvProduct.Nodes.Add(Newnode)
End If
But It not works please Suggest