Will the controls in my car work for an after market stereo?

My Jeep Grand Cherokee has controls on the backside of the steering wheel that allow me to control the stock stereo/CD player that it has. This way I don't have to reach over to the stereo while I'm driving and I really like this feature. The only problem is that there is no AUX input and I had gotten quite used to listening to my ipod in the car. (This is my new car. In my old Jetta I had an after market stereo with AUX input installed for this reason). I tried the itrip that plugs into my ipod and transmits through a radio station. I got nothing, only static. I had to hold the ipod out the window next to the antenna to get a signal. I am thinking about just buying a new stereo but I'm not sure the controls for the stereo on my steering wheel will still work. Has anyone had any experience with this?