public TreeView(Tree tree, SampleClient client)
        {
            InitializeComponent();
            BindingContext = nodes;

            storedTree = tree;
            opcClient  = client;
            DisplayNodes();
        }
 public MainPage()
 {
     InitializeComponent();
     textInfo       = new LabelViewModel();
     OpcClient      = new SampleClient(textInfo);
     stacklayout    = new StackLayout();
     BindingContext = textInfo;
     endpointUrl    = null;
 }