void grd_loc_Tap(object sender, GestureEventArgs e) { if (Mymap.Layers.Contains(mypositionPoi)) { Mymap.Layers.Remove(mypositionPoi); mypositionPoi.Clear(); } if (Mymap.Layers.Contains(detailPois)) { Mymap.Layers.Remove(detailPois); detailPois.Clear(); } }