SetFocusOnSelectedBehavior.cs

using System.ComponentModel;
 
namespace NeuroAccessMaui.UI.Behaviors
{
    public class SetFocusOnSelectedBehavior : Behavior<Picker>
    {
        [TypeConverter(typeof(ReferenceTypeConverter))]
        public View? SetFocusTo { get; set; }
 
        protected override void OnAttachedTo(Picker Picker)
        {
            Picker.SelectedIndexChanged += this.Picker_SelectedIndexChanged;
            base.OnAttachedTo(Picker);
        }
 
        protected override void OnDetachingFrom(Picker Picker)
        {
            Picker.SelectedIndexChanged -= this.Picker_SelectedIndexChanged;
            base.OnDetachingFrom(Picker);
        }
 
        private void Picker_SelectedIndexChanged(object? Sender, EventArgs e)
        {
            SetFocusOnClickedBehavior.FocusOn(this.SetFocusTo!);
        }
    }
}