This syntax is a databinding-expression and it will work only when the RadMenu is bound, for instance:
sender, EventArgs e)
Alternatively, you can traverse the existing RadMenu items in the PreRender event and change the NavigateUrl programmatically. The traversing can happen either by using the radMenu2.Items collection or FindItemByText or FindItemByValue.
That should resolve the issue. Feel free to give it a try and let me know about the result.
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