I had the same problem with Talon. She would fly over to our parakeet cage. One time, she even pulled the entire nail out of one of our parakeets!! :ohmy: There was blood everywhere... :( I called the vet, and luckily it stopped bleeding and was okay, but sore.
When ever she goes there, I do one of 2 things, I pick her up and tell her, "No, she's not allowed there" and I say, 'DANGER, DANGER, DANGER!" She knows that is a bad place for her to be when I say that, I use it when ever she gets anywhere near something hot. The second thing I do, is spray her with a spray bottle which she hates!!
She rarely goes there anymore.
I am sure you will find what works for you, just be diligent, and patient, it will take time.