title: How to convert SubView's Frame Coordinate System to Self View's Coordinate System
body: <p>I create programmatically one scrollView and some buttons inside there. When I click the any button have to show a popover. </p>
  
  <p>My button's origin in self.view is like (100,11) and inside scrollView (9,11) and scrowView is in somewhere in self.view. The popover shows in (9,11) but right one would be (100,11). I try use convert without success. </p>
  
  <pre><code>-(IBAction)showPopover:(id)sender{
  //... implemented popover above
  
  //Wrong Origin:
  NSLog(@"wrong x:%f y:%f",[sender frame].origin.x, [sender frame].origin.y);
  
  //Transform to correct
  CGRect frame = [self.view convertRect:[sender frame] toView:nil];
  
  //Shoulf be right, but is not...
  NSLog(@"new x:%f y:%f",frame.origin.x, frame.origin.y);
  }
  </code></pre>
  
  <p>Anyone cam help me?</p>