//Nib からロードされた時に実行される 
- ( void )windowControllerDidLoadNib:(NSWindowController *) aController
{
NSArray *windowColtroller = [ self  windowControllers];
NSWindowController *winc = [[NSWindowController alloc] initWithWindowNibName: @"MyDocument" ];
NSLog([windowColtroller description]);
[ self  addWindowController:winc];

NSLog([[ self  windowControllers] description]);
[ super  windowControllerDidLoadNib:aController];

}