public void ShowCustomPopup(MapMember mapMember, long objectID)
{
//Get the active map view.
var mapView = MapView.Active;
if (mapView == null)
return;
//Create custom popup content from existing map member and object id
var popups = new List<PopupContent>();
popups.Add(new PopupContent(mapMember, objectID));
//Create a new custom command to add to the popup window
var commands = new List<PopupCommand>();
commands.Add(new PopupCommand(
p => MessageBox.Show(string.Format("Map Member: {0}, ID: {1}", p.MapMember, p.IDString)),
p => { return p != null; },
"My custom command",
System.Windows.Application.Current.Resources["GenericCheckMark16"] as ImageSource));
mapView.ShowCustomPopup(popups, commands, true);
}