I looked at the picture you attached and I am not sure which one of the designs you want to implement. However you can modify the look of the RadToggleButton using a one of the following approaches:
1) You could you use a custom style for the RadToggleButton and reuse some of the VisualStates that you want to keep.
2) Another approach is to directly use the Content property of the Button and do the logic there, here is an example how you can do that:
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