public MainWindow() { InitializeComponent(); ViewModel = new DialViewModel { Max = 100, Min = 50, Value = 75, Notches = { new Dial360Notch(label: "A", angle: -150), new Dial360Notch(label: "B", angle: 150) } }; _timer = new DispatcherTimer(TimeSpan.FromMilliseconds(200), DispatcherPriority.ApplicationIdle, OnTick, Dispatcher); Loaded += OnLoaded; }