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[frankus]

I was able to get the return key to work as follows:

1. Add the UITextFieldDelegate protocol to your controller.
2. Set the delegate of the UIAlertView's text field to self.
3. Add the following function:

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
	[(UIAlertView *)[textField  superview] dismissWithClickedButtonIndex:1 animated:YES];
	
	return NO;
}

This will intercept the return key press and use it to dismiss the alert with the "OK" button pressed.