private void RemoveMapPolygons(IEnumerable <MapPolygon> polygons)
 {
     foreach (var oldPolygon in polygons)
     {
         DigiTransitMapControl.MapElements.Remove(oldPolygon);
     }
     MapElementsChanged?.Invoke(this, EventArgs.Empty);
 }
 private void AddMapIcons(IEnumerable <MapIcon> icons)
 {
     foreach (var newIcon in icons)
     {
         DigiTransitMapControl.MapElements.Add(newIcon);
     }
     MapElementsChanged?.Invoke(this, EventArgs.Empty);
 }