Telerik RadTextBox with exclamation mark

Question

The RadTextBox in this example shows an exclamation mark icon (!) if no input is available. The example on this page shows how to use RadInputManager to extend normal asp textboxes to have the exclamation mark: http://demos.telerik.com/aspnet-ajax/input/examples/radinputmanager/firstlook/defaultcs.aspx

However, there doesn't seem to be an example as to how this exclamation mark can be displayed if I am already using a RadTextBox... Is this feasible?

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It's worth noting that I am interested in this because it's cleaner than writing out an error message... Any other technique (ie highlighting the empty text box etc.) would work equally well for me.

Answer 1

I suppose you can do the same by attaching asp RequiredFieldValidator to your RadTextBox and display the icon as part of your validator error message. Still the more convenient way is to use asp TextBoxes and RadInputManager, especially when you have several textboxes in place.

Dick