title: NSMatrix and Push buttons from IB
body: <p>I'm trying to create a group of buttons that behave like radio group created from IB. 
  I read from <a href="http://developer.apple.com/library/mac/#documentation/cocoa/Conceptual/Matrix/Concepts/MatrixSelectionModes.html" rel="nofollow">documentation</a> that i can do that using NSRadioModeMatrix but i don't know how  to insert buttons in a matrix via IB. </p>
  
  <p>If it would't possible could you kindly guide me in this operation with programmatically ?
  (i also ask you :it is possible to add buttons via IB and only NSMatrix via code ? ).</p>