Placement of 3D Markers

Hi,

i'm struggling to set 3D markers by code..

a method:
    public void AddMarker(float latitude, float longitude){

        //Create a marker to show the current GPS coordinates.
        locationMarker = control.AddMarker3D(new Vector2(latitude, longitude), prefab);
        locationMarker.range = new OnlineMapsRange(1, 20);
        //Hide handle until the coordinates are not received.
        locationMarker.enabled = true;
    }

places the marker correctly in the scene. But everytime i move the camera or click somewhere, the marker gets disabled.

If i use the buildin feature of the OnlineMapsTileSetControl.cs and enable marker placement via "N" it works.
It works so good, i get 2 gameobject placed every time, on a spot near my mouse and a second instance wich sits at 0,0,0 .

Please tell my how i can place custom prefabs wich correctly move with the world, as it gets updated.

(Do i have to use the update via Location Service or can i use my own GSP signal Manager und just update the map?)