if (self.isPresentedInPopover)
    self.contentSizeForViewInPopover = CGSizeMake(320.0, 480.0);

- (void)hideKeyboard{

    // hide keyboard
    BOOL didResignFirstResponder = [self.view endEditing:YES];
}

- (void)navigationController:(UINavigationController*)navigationController didShowViewController:(UIViewController*)viewController animated:(BOOL)animated{

    if (navigationController == myPopover.contentViewController)
        my.popoverContentSize = CGSizeMake(320.0, 480.0);

    // also tried setting this after a delay - didn't work
}

- (void)actionFinishedWithThisController:(id)sender{

    if (self.isPresentedInPopover)
    {
        [self hideKeyboard];
        [super performSelector:@selector(backBarItemTapped:) withObject:sender afterDelay:0.05];
    }
    else
    {
        [super backBarItemTapped:sender];
    }
}

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    [self.popoverController presentPopoverFromRect:self.textField.frame inView:self permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}