Thanks for the reply, this does work but only when the button postsback.
In my scenario the order is not updating. I am using the attribute value to pass through to a stored proc which updates order in table.
As an example to demonstrate my result, if I add a tooltip for each node in the RadTreeView_NodeDataBound from the example you gave me, the attribute value doesn't update.
|e.Node.ToolTip = (e.Node.DataItem as DataRowView)["Order"].ToString();
How can I update the value?
Many thanks in advance.