Ann Marie I managed it with Calum when the site was down.
I use the green spouted magic cup as well and previous (like your LO) he refused milk in it.
I have been using NUK bottles and happened to look on ther website to see thay had brough out a new bottle. As I had aldready bought 3 of their bottles, I decided to try the new teat. It is a sippy teat that fits the existing bottles he uses.
I started off by putting the sippy teat on the bottle to start with (sitting on my knee with his back to me, so I can guide in his mouth), at first he would only take an oz or so before I had to put the old 'normal' teat back on, but over a week (if that) he was happily drinking from the bottle with the sippy teat AND starting to hold it himself. At this stage he was still on my lap with his back to me, so I can tilt him back when needed.
Eventually he would hold the bottle with the sippy top for the entire feed, so it got to the stage I could plonk him on a chair, where he could see me and he would drink the milk. It was when he was ill and I didn't intend to give him milk or I didn't think he would take it that I first tried out of a proper sippy cup and he took it first time.
Using his bottle with the new sippy teat worked great for us, but I made sure that I took it off him as soon as he started to shake it about, because it isn't leak proof.
Hope that makes sense, I have gone on a bit.....
Lauren xxx
If you can't get sippy teats for your bottles, just try your LO on your lap with his back to you with his normal sippy and even if he takes an 1oz, give the rest in his bottle and keep trying.