title: Callout from MKPolylineView?
body: <p>Is there any way to show a callout when a person touch a MKPolylineView? 
  i tried to add a UITapGestureRecognizer and in selector display a callout in some coordinate. but didnt work. any suggestions for making this?</p>
  
  <p>the following is what i tried in method </p>
  
  <pre><code> - (MKOverlayView *)mapView:(MKMapView *)mapa viewForOverlay:(id &lt;MKOverlay&gt;)overlay
          self.polylineView = [[MKPolylineView alloc] initWithPolyline: self.polyline];
          self.polylineView.strokeColor = [UIColor blackColor];
          self.polylineView.lineWidth = 5.0;
          self.polylineView.alpha = 0.7;
          UITapGestureRecognizer *touchOnView = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(addBubble:)];
          [touchOnView setNumberOfTapsRequired:1];
          [touchOnView setNumberOfTouchesRequired:1];
          [self.polylineView addGestureRecognizer:touchOnView];
  </code></pre>