How binding data to a groupbox of radiobuttons

Hi, Please I need help, I have a groupbox that contains 2 radiobuttons. So i want to bind to it a datafield (having only 2 values : 1 for the first radiobutton, or 2 for the second radiobutton). Please can someone show me how to use databinding with this groupbox. Thank you in advance. Intibnin...

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