The AutoDisplay property enables the automatic display of features on a McGraphOverlay (the AutoDisplayOverlay). In most cases, setting McGraphOverlay.Template properties for the AutoDisplayOverlay, followed by an assignment to AutoDisplay will be all that is needed for feature display.
Complete control of automatic feature display is accessed through the DisplayOverlays property. And in fact, this property is just a shortcut to the DisplayOverlays.MasterGraphOverlays property.