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For Selected Event you should look at your right side of mashup builder, there for the service that fills(binded) the RadioButton you have a Selected Row to get the Selected value on the Radio button.
You also have a Selected Row event on the right side (service) in order to trigger the other service that you want to trigger.
Hi,
You can use the Generic Radio button from Market place.See the attached screenshot.
Create the state definitions for Radio button states and map the states "ButtonStates"
You can bind the "SelectedValue" property to text data for display the selected radio button text.
Map the "SelectionChanged" event to service.
Thank You.