private void Mymap_Hold(object sender, GestureEventArgs e)
{
if (Mymap.Layers.Contains(floorPoisDetail))
Mymap.Layers.Remove(floorPoisDetail);
if (!_tileLoaded)
RemoveIndoorStaff();
var p = e.GetPosition(this.Mymap);
_tapLocation = new GeoCoordinate();
_tapLocation = Mymap.ConvertViewportPointToGeoCoordinate(p);
_isSearch = false;
AddPoi(_tapLocation);
}