MTD disable scolling up and down

Hi, I'm using MTD with a couple of EntryElements on the screen. When testing on a real device I can scroll the the dialog up and down making the screen look at little mis-aligned. I tried disabling user interaction but that obviously disables the keyboard. What options do I have in order to fix the position of the dialog view on the screen.

I attached the screen shots of what happens to the field when the user scrolls up and down.

        var root = CreateRoot ();
        var dv = new MyDialogViewController (root, true);
        nvc.PushViewController(dv,true);
        nvc.NavigationItem.SetHidesBackButton(true,true);  
        nvc.NavigationBar.Hidden = true;