Datepicker using dialog method - on the iPhone

Hello there,

I am trying to implement a version of the datepicker. However, I would like the calendar to open in a modal dialog box rather than sliding open next to the text box.

This is the closest example I've been able to find, but there are a few issues - I would like the user to click on the text box to change the input, and obviously the small input box in the corner of the calendar is a problem...