Hello,
You can use CustomValidator and to check if control is ReadOnly. Or you can add the validators only if the controls are not ReadOnly.
I am not sure about the other controls. Maybe they are overriding parts of the JavaScripts of the Validators to achieve this. However we are not supporting such functionality to validate the TextBoxes only if they are not read only.
There is a thread in Microsoft's site about the issue:
http://support.microsoft.com/kb/917733 and it looks more like a problem, than a desired function of the Validator controls.
All the best,
Vasil
the Telerik team
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