coding prob. iOS soft keyboard doesn't retract

I've made a neat little questionnaire for a client, running on Ipad2 with AIR for iOS 2.7  There are radio buttons for multiple choice answers to questions and a few text input fields for user info. My problem is that after I leave any of the text fields and press the "submit" button the keyboard stays out and can be put away only manually, with the little retract key in the lower right corner.

Anyone know how to code for this in AS3?

thanks, c.u.