public GradientPickerView(GradientModel gradientModel, string callbackString1 = "", string callbackString2 = "")
 {
     InitializeComponent();
     DataContext = new GradientPickerViewModel(gradientModel, callbackString1, callbackString2);
 }
 public GradientPickerView()
 {
     InitializeComponent();
     DataContext = new GradientPickerViewModel();
 }