window2

var win : NSWindow? = nil;

class ViewController: NSViewController{
  //..
  override func KeyDown(theEvent:NSEVENT){
    f.KeyDown(theEvent);
    if let keyString = theEvent.charactersIgnoringModifiers where keyString == "u" || keyString == "U"{
      if(win == nil){
      win = NSWindow(contentRect : NSMakeRect(100, 100, 600, 200).
-          styleMask: NSResizeAbleWindowMask,
-          backing:NSBackingStoreType.Buffered, defer: false);
      self.view.window?.addChildWindow(win, ordered: .Above);
      win.makeKeyAndOrderFront(theEvent);
    }
    else{
    win.close();
    se;f.view.window?.removeChildWindow(win!);
    win = nil;
    }
  }
}