StateProperties.cs

namespace NeuroAccessMaui.Helpers
{
    public static class StateProperties
    {
        public static readonly BindableProperty StateProperty =
            BindableProperty.CreateAttached(
                propertyName: "State",
                returnType: typeof(object),
                declaringType: typeof(StateProperties),
                defaultValue: null,
                propertyChanged: OnStateChanged);
 
        public static object? GetState(BindableObject View)
            => View.GetValue(StateProperty);
 
        public static void SetState(BindableObject View, object? Value)
            => View.SetValue(StateProperty, Value);
 
        static void OnStateChanged(BindableObject Bindable, object? OldValue, object? NewValue)
        {
            Console.WriteLine($"New state for {Bindable.GetType().Name} : Value: {NewValue}");
            // If you want controls to transition VisualState, uncomment below:
            // if (bindable is VisualElement ve && newValue is not null)
            //     VisualStateManager.GoToState(ve, newValue.ToString());
 
            // Else, this attached property solely reflects state for DataTriggers.
        }
    }
}