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How to remove iPad's Popover arrow and its frame border
- (void) viewWillAppear: (BOOL) animated
{
    [super viewWillAppear: animated];

    UIView* v = self.view.superview;
    NSLog( @"%@", NSStringFromClass( [v class]) ); // this should print UIView

    v = v.superview;
    NSLog( @"%@", NSStringFromClass( [v class]) ); // this should print UIPopoverView

    [[v.layer.sublayers objectAtIndex:0] removeFromSuperlayer];
}