Thank you for the clarification. Every action in Silverlight is a real action (that means that it affects the browser in the same way that a real user would affect the browser) therefore Test Studio is not recording "Check to be true".
The only way to databound the radio buttons is via a coded step.
"Male is False"
This will check the radio button if the "Male" column is True.
Here is a demonstration video.
Hope this helps.
the Telerik team