RadInputManager works with standard HTML textboxes (<input type="text" />) if you add them on the client by using the addTargetInput method of a given RadInputManager setting:
The HTML textboxes must have IDs - you can hardcode some.
You cannot add HTML textboxes on the server, because they do not really exist there and cannot be referenced as textboxes.
Currently you must add at least one asp:TextBox to a RadInputManager setting, otherwise the control will not work on the client. This requirement will be removed in the next version of RadControls.
All the best,
the Telerik team
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