I'm trying to receive notification when the keyboard appears but I'm in a situation where I have 2 UITextViews and need to be able to differentiate between them. For some reason, I can't figure out how to filter this using the object parameter of "addObserver". I've got something like this:

```
 UITextView* w = mSubview.mText;
 NSNotificationCenter* dnc = [NSNotificationCenter defaultCenter];
 [dnc addObserver:self selector:@selector(showNotesKeyboard:)  name:UIKeyboardWillShowNotification object:w ];

```

Whenever I specify `w` I don't enter `showNotesKeyboard`. Only when I pass in `nil` does the notification actually get picked up. There must be something I'm missing here, please help me out.
Thanks!