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NSTextField not editable in custom NSWindow
NSRect windowRect = [[self.window contentView] frame] ;
      NSWindow* uiWindow          = [[NSWindow alloc]  initWithContentRect:windowRect
                    styleMask:NSBorderlessWindowMask
                    backing:NSBackingStoreBuffered defer:YES];
      [uiWindow setBackgroundColor: [NSColor redColor/*clearColor*/]];
      [uiWindow setOpaque:NO];

      NSView* uiView = [[[NSView alloc] initWithFrame:NSMakeRect(0, 0, windowRect.size.width, windowRect.size.height)] autorelease];
      [uiView translateOriginToPoint:NSMakePoint(100, uiView.bounds.size.height/2)];
      uiView.wantsLayer = YES;

      [uiWindow setContentView:uiView];

      NSTextField *textField;
      textField = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 800, 80)];
      [textField setFont:[NSFont fontWithName:@"Helvetica Bold" size:60]];
      [textField setStringValue:@"My Label"];
      [textField setBezeled:YES];
      [textField setDrawsBackground:YES];
      [textField setEditable:YES];
      [textField setSelectable:YES];
      [textField setEnabled:YES];

      [uiView addSubview:textField];


// THIS DOES NOT WORK
[self.window addChildWindow:uiWindow ordered:NSWindowAbove];

// THIS WORKS
//[_graphicView addSubview:uiView];

- (BOOL)canBecomeKeyWindow
{
    return YES;
}

if([uiWindow isKeyWindow] == TRUE) {
    NSLog(@"isKeyWindow!");
}
else {
    NSLog(@"It's not KeyWindow!");
}