title: Changing icon for NSWindow title
body: <p>I am trying to change the proxy icon of a document window at runtime using</p>
  
  <p>[[[self window] standardWindowButton:NSWindowDocumentIconButton] setImage:img];</p>
  
  <p>This is getting executed but the setting in info.plist is overriding this.</p>
  
  <p>What is the right place to call this.</p>