I am new to iPhone programming. I am working on web app with pop-up menu function. While testing, upon taping on pop-up menu, the selector wheel appears and the main screen zooms in on the pop-up menu field. After selecting value from the selector wheel the main screen doesn't zoom out but stays zoomed in. It zooms out only after double clicking on the main screen. Do I need to modify the code or set up some parameters to prevent this from happening.