ControlGUI/GUI/GUIUtils/CheckGroup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GUI.GUIUtils
{
    public class CheckGroup<UICheckableType> : LinkedList<WeakReference<UICheckableType>> where UICheckableType : Control, ICheckableUI
    {
        public void AddSafe(params UICheckableType[] checkable)
        {
            foreach (var it in checkable)
            {
                it.ResetClick();
                it.Click += (sender, _) => CheckedObject = (UICheckableType)sender;
                _ = AddFirst(new WeakReference<UICheckableType>(it));
            }
        }

        WeakReference<UICheckableType> checkedObjectReference;

        public UICheckableType CheckedObject
        {
            get
            {
                if (checkedObjectReference == null) return null;
                if (checkedObjectReference.TryGetTarget(out UICheckableType target)) return target;
                else checkedObjectReference = null;
                return null;
            }
            set
            {
                foreach (var it in this)
                    if (it.TryGetTarget(out UICheckableType target))
                        target.IsChecked = target == value;
            }
        }
    }
}