public AddTree(string fk)
 {
     try
     {
         InitializeComponent();
         BindingContext = new AddTreeViewModel(Navigation, fk);
     }
     catch (Exception e)
     {
         var myerror = e.Message; // error
         //  Log.Fatal(e);
     };
 }
 public AddTree()
 {
     InitializeComponent();
     BindingContext = new AddTreeViewModel(Navigation);
 }