var mapView = MapView.Active; if (mapView == null) return; //Create custom popup content var popups = new List<PopupContent>(); popups.Add(new PopupContent("<b>This text is bold.</b>", "Custom tooltip from HTML string")); popups.Add(new PopupContent(new Uri("http://www.esri.com/"), "Custom tooltip from Uri")); mapView.ShowCustomPopup(popups);