Dashboard/Quik/Controls/ContainerControl.cs

using System;
using System.Collections;
using System.Collections.Generic;

namespace Dashboard.Controls
{
    public abstract class ContainerControl : Control, ICollection<Control>
    {
        private readonly List<Control> children = new List<Control>();

        public int Count => children.Count;

        public bool IsReadOnly => false;

        public void Add(Control item)
        {
            children.Add(item);
        }

        public void Clear()
        {
            children.Clear();
        }

        public bool Contains(Control item)
        {
            return children.Contains(item);
        }

        public void CopyTo(Control[] array, int arrayIndex)
        {
            children.CopyTo(array, arrayIndex);
        }

        public IEnumerator<Control> GetEnumerator()
        {
            return children.GetEnumerator();
        }

        public bool Remove(Control item)
        {
            return children.Remove(item);
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return children.GetEnumerator();
        }
    }
}