ControlGUI/GUI/BottomButton.cs

using GUI.GUIUtils;
using GUI.Properties;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GUI
{
    public partial class BottomButton : PictureBox, ICheckableUI
    {
        bool isChecked;

        public bool IsChecked
        {
            get => isChecked;
            set
            {
                isChecked = value;
                if (isChecked) Image = Resources.Button_Checked;
                else Image = Resources.Button_Unchecked;
            }
        }

        public BottomButton()
        {
            Click += ButtonOnClick;
            Image = Resources.Button_Unchecked;
            SizeMode = PictureBoxSizeMode.Zoom;
        }

        void ButtonOnClick(object sender, EventArgs e)
        {
            IsChecked = !IsChecked;
        }

        public void ResetClick()
        {
            Click -= ButtonOnClick;
        }
    }
}