private void RemoveConnectionEvents(ConnectionViewModel vm)
 {
     vm.Connection.ConnectModeChanged -= Connection_ConnectModeChanged;
     vm.Connection.UnitIdChanged      -= Connection_ConnectModeChanged;
 }
 private void AttachConnectionEvents(ConnectionViewModel vm)
 {
     vm.Connection.ConnectModeChanged += Connection_ConnectModeChanged;
     vm.Connection.UnitIdChanged      += Connection_ConnectModeChanged;
 }