Thanks for writing.
As far as I understand you would like to combine the behavior of RadRadioButton with the appearance of RadToggleButton. If this is the case, there are two general approaches:
1. The first one is to use four RadRadioButtons and to customize their appearance so that they look like RadToggleButtons. For your convenience I have already customized the ControlDefault theme in such a way which can be found in the attached project. In case you need other themes for your application, you can easily modify the default themes by using our Visual Style Builder tool. Here are some help articles:
2. The second approach is to use four RadToggleButtons and customize their behavior so that they behave as a group of RadRadioButtons. In this case you will have to handle the ToggleStateChanged event and implement your own logic to change the ToggleState of the buttons. Please have in mind that changing the ToggleState within the ToggleStateChanged event might introduce some additional difficulties.
I hope you find my answer useful. Let me know if you have further questions.
the Telerik team
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