private void SetRespawnMode(object obj)
{
var mode = (RespawnBehavior)Enum.Parse(typeof(RespawnBehavior), obj.ToString());
Placement.respawn = mode;
_screen.Stage.Dirty = true;
OnPropertyChanged("RespawnsOffscreen");
OnPropertyChanged("RespawnsDeath");
OnPropertyChanged("RespawnsStage");
OnPropertyChanged("RespawnsNever");
}