I have a map with labels to places that use a graphic image rather than one of the pre-defined ESRI position markers and the callout simple line is drawn from the center of the image. Given the simple line is on top of the image, how can I make it such that the line is either drawn behind the image or with an offset such that it begins a given number of points away from the image center? I had thought this was the leader tolerance in the callout although changing this value does not appear to have any noticeable effect.