implement all BrowserWindow API Events and the rest of missed functions

ElectronNET.API/Entities/ThumbarButton.cs

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+using Newtonsoft.Json;
+using System;
+
+namespace ElectronNET.API.Entities
+{
+    public class ThumbarButton
+    {
+        public string Id { get; internal set; }
+
+        [JsonIgnore]
+        public Action Click { get; set; }
+
+        /// <summary>
+        /// Control specific states and behaviors of the button. By default, it is ["enabled"].
+        /// 
+        /// enabled - The button is active and available to the user.
+        /// disabled - The button is disabled.It is present, but has a visual state indicating it will not respond to user action.
+        /// dismissonclick - When the button is clicked, the thumbnail window closes immediately.
+        /// nobackground - Do not draw a button border, use only the image.
+        /// hidden - The button is not shown to the user.
+        /// noninteractive - The button is enabled but not interactive; no pressed button state is drawn.This value is intended for instances where the button is used in a notification.
+        /// </summary>
+        public string[] Flags { get; set; }
+
+        /// <summary>
+        /// The icon showing in thumbnail toolbar.
+        /// </summary>
+        public string Icon { get; set; }
+
+        /// <summary>
+        /// The text of the button's tooltip.
+        /// </summary>
+        public string Tooltip { get; set; }
+
+        public ThumbarButton(string icon)
+        {
+            Icon = icon;
+        }
+    }
+}

ElectronNET.API/Extensions/ThumbarButtonExtensions.cs

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+using ElectronNET.API.Entities;
+using System;
+using System.Collections.Generic;
+
+namespace ElectronNET.API.Extensions
+{
+    internal static class ThumbarButtonExtensions
+    {
+        public static ThumbarButton[] AddThumbarButtonsId(this ThumbarButton[] thumbarButtons)
+        {
+            for (int index = 0; index < thumbarButtons.Length; index++)
+            {
+                var thumbarButton = thumbarButtons[index];
+
+                if (string.IsNullOrEmpty(thumbarButton.Id))
+                {
+                    thumbarButton.Id = Guid.NewGuid().ToString();
+                }
+            }
+
+            return thumbarButtons;
+        }
+
+        public static ThumbarButton GetThumbarButton(this List<ThumbarButton> thumbarButtons, string id)
+        {
+            ThumbarButton result = new ThumbarButton("");
+
+            foreach (var item in thumbarButtons)
+            {
+                if (item.Id == id)
+                {
+                    result = item;
+                }
+            }
+
+            return result;
+        }
+    }
+}