c# - GMap.Net marker initially in incorrect position -

i have added marker using gmap lat/long specified. when application starts, marker placed in incorrect position(at center of gmap control) , when zoom, goes specified coordinates. bug in gmap or doing wrong? here code.

    gmapoverlay markersoverlay, mo2;     gmarkergoogle marker, marker5;       gmapoverlay polyoverlay;     list<pointlatlng> points;     gmaproute gr;     graphics g;     bool start = true;     double move = .0001;     //double move = 1;     double lt = 73, lg = -180;     //  double lt = 29, lg = -93;          public form1()     {         allocconsole();         initializecomponent();         try         {             system.net.iphostentry e =                  system.net.dns.gethostentry("www.google.com");         }         catch         {             gmap.manager.mode = accessmode.cacheonly;             messagebox.show("no internet connection avaible, going cacheonly mode.",                   "gmap.net - demo.windowsforms", messageboxbuttons.ok,                   messageboxicon.warning);         }          gmap.mapprovider = gmapproviders.binghybridmap;         gmap.position = new pointlatlng(32, -100);         gmap.minzoom = 3;         gmap.maxzoom = 15;         gmap.zoom = 9;          markersoverlay = new gmapoverlay("markers");         mo2 = new gmapoverlay("markers5");         marker5 = new gmarkergoogle(new pointlatlng(lt, lg),          gmarkergoogletype.orange_small);            g = this.creategraphics();           }        private void form1_load(object sender, eventargs e)     {          gmap.dragbutton = mousebuttons.left;         gmap.showcenter = false;         points = new list<pointlatlng>();         polyoverlay = new gmapoverlay("polygons");         // gmap.position = new pointlatlng(32.6961334816182, -100.2985095977783);         //   gmap.minzoom = 0;          gmappolygon polygon = new gmappolygon(points, "mypolygon");         polygon.fill = new solidbrush(color.fromargb(50, color.magenta));         // polygon.f         polygon.stroke = new pen(color.magenta, 2);            }     protected void onmousemove(object sender, mouseeventargs e)     {         // base.onmousemove(e);         pointlatlng p = gmap.fromlocaltolatlng(e.x, e.y);         mouselatlong.text = convert.tostring(p);         // console.writeline(marker.position.lat);     }      private void submitbutton_click(object sender, eventargs e)     {         //  gmap.position = new pointlatlng(40.6961334816182, -100.2985095977783);           marker = new gmarkergoogle(new pointlatlng(double.parse(lattextbox.text), double.parse(longtextbox.text)),          new bitmap(@"c:\users\vaib\documents\visual studio 2013\projects\testgmap\testgmap\resources\wpt.png"));         // gmarkergoogle marker = new gmarkergoogle(new pointlatlng(-25.966688, 32.580528),flag);         mo2.markers.add(marker);         gmap.overlays.add(mo2);         marker.tooltip = new gmaptooltip(marker);         marker.tooltiptext = nametextbox.text;         marker.tooltipmode = markertooltipmode.always;          //  x++;         if (start)         {             gmap.position = new pointlatlng(marker.position.lat, marker.position.lng);             start = false;          }            points.add(new pointlatlng(marker.position.lat, marker.position.lng));         // points.add(new pointlatlng(double.parse(lattextbox.text), double.parse(longtextbox.text)));          // gmappolygon polygon = new gmappolygon(points, "mypolygon");         gr = new gmaproute(points, "route");         gr.stroke = new pen(color.magenta, 2);         //console.writeline(gr.from + "-->"+gr.to);         // polygon.stroke = new pen(color.magenta, 2);         polyoverlay.routes.add(gr);         gmap.overlays.add(polyoverlay);          //  m1 = new gmarkergoogle(new pointlatlng(gr.from.value.lat, gr.from.value.lng),         //gmarkergoogletype.yellow_small);         ga = new gmarkerarrow(new pointlatlng(gr.from.value.lat, gr.from.value.lng));         if (points.count >= 2)             ga.bearing = (float)final(gr.from.value.lat, gr.from.value.lng, points[1].lat, points[1].lng);         //         marker2 = new gmapmarkerimage(new pointlatlng(marker.position.lat, marker.position.lng),          markersoverlay.clear();         //m1.rot(180);         // m1.onrender(g);         //  markersoverlay.markers.add(marker2);         markersoverlay.markers.add(ga);         gmap.overlays.add(markersoverlay);           } 

the trick first add overlay , marker:

gmapcontrol.overlays.add(markersoverlay); markersoverlay.markers.add(marker);