private static void OnTargetObjectChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            CallMethodAction callMethodAction = (CallMethodAction)sender;

            Type newType = args.NewValue != null?args.NewValue.GetType() : null;

            callMethodAction.UpdateTargetType(newType);
        }
        private static void OnMethodNameChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
        {
            CallMethodAction callMethodAction = (CallMethodAction)sender;

            callMethodAction.UpdateMethodDescriptors();
        }