VitDeck GUI flow

Info.cs

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

namespace VitDeck.Main
{
    public class Info
    {
        public static event Action<Info> OnInstantiated;

        public static Info Open()
        {
            var instance = new Info();
            if (OnInstantiated != null)
                OnInstantiated.Invoke(instance);

            return instance;
        }
    }
}

InfoGUI.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

namespace VitDeck.Main.GUI
{
    public class InfoGUI : EditorWindow
    {
        [SerializeField]
        string instanceID = null;
        [SerializeField]
        string version = null;

        [InitializeOnLoadMethod]
        static void Bind()
        {
            Info.OnInstantiated += Info_OnInstantiated;
        }

        private static void Info_OnInstantiated(Info obj)
        {
            var gui = CreateInstance<InfoGUI>();
            gui.titleContent = new GUIContent("VitDeck Info");
            gui.Attach(obj);
            gui.Show();
        }

        private void Attach(Info instance)
        {
            instanceID = "instanceID = " + instance.GetHashCode().ToString();
            version = "Version = " + VitDeck.Version;
        }

        private void OnGUI()
        {
            EditorGUILayout.LabelField("VitDeck", EditorStyles.largeLabel);
            EditorGUILayout.LabelField(instanceID);
            EditorGUILayout.LabelField(version);
        }
    }
}

MainMenuGUI.cs

using UnityEditor;

namespace VitDeck.Main.GUI
{
    public static class MainMenuGUI
    {
        const string prefix = "VitDeck/";
        
        [MenuItem(prefix + "Info")]
        static void Information()
        {
            Info.Open();
        }
    }
}