title: Set Window Resizable
body: <p>In IB this can be done easily by checking the 'Resize' checkbox on or off.
  My problem is I want my main NSWindow to not be resizable, until a button is clicked, and then i want it to be resizable.</p>
  
  <p>I've scoured the Internet but can't find anything? Can a window not be made to be resizable or not programmatically? </p>
  
  <p>Thanks in advance everyone!</p>