MyCustomAddOn.cs

#region Using declarations
using System;
using System.Windows;
using System.Windows.Controls;
using NinjaTrader.Gui;
using NinjaTrader.Gui.Tools;
using NinjaTrader.NinjaScript;
#endregion

namespace NinjaTrader.NinjaScript.AddOns
{
    public class MyAddOn : AddOnBase
    {
        private NTMenuItem myAddOnMenuItem;
        private NTMenuItem existingMenuItemInControlCenter;
        private MyAddOnWindow window;

        protected override void OnWindowCreated(Window window)
        {
            ControlCenter cc = window as ControlCenter;
            if (cc == null)
                return;

            existingMenuItemInControlCenter = cc.FindFirst("ControlCenterMenuItemTools") as NTMenuItem;
            if (existingMenuItemInControlCenter == null)
                return;

            myAddOnMenuItem = new NTMenuItem { Header = "My AddOn" };
            existingMenuItemInControlCenter.Items.Add(myAddOnMenuItem);
            myAddOnMenuItem.Click += OnMenuItemClick;
        }

        protected override void OnWindowDestroyed(Window window)
        {
            if (myAddOnMenuItem != null && window is ControlCenter)
            {
                if (existingMenuItemInControlCenter != null && existingMenuItemInControlCenter.Items.Contains(myAddOnMenuItem))
                    existingMenuItemInControlCenter.Items.Remove(myAddOnMenuItem);

                myAddOnMenuItem.Click -= OnMenuItemClick;
                myAddOnMenuItem = null;
            }
        }

        private void OnMenuItemClick(object sender, RoutedEventArgs e)
        {
            Core.Globals.RandomDispatcher.BeginInvoke(new Action(() => new MyAddOnWindow().Show()));
        }

        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Description = @"My AddOn";
                Name = "MyAddOn";
            }
        }
    }

    public class MyAddOnWindow : NTWindow
    {
        public MyAddOnWindow()
        {
            Caption = "My AddOn Window";
            Width = 300;
            Height = 200;

            StackPanel panel = new StackPanel();
            Content = panel;

            Button button1 = new Button { Content = "Button 1" };
            button1.Click += (sender, e) => {
                // Instead of Print()
                NinjaTrader.Code.Output.Process("bt1", PrintTo.OutputTab1);
            };
            panel.Children.Add(button1);

            Button button2 = new Button { Content = "Button 2" };
            button2.Click += (sender, e) => {
                // Instead of Print()
                NinjaTrader.Code.Output.Process("bt2", PrintTo.OutputTab1);
            };
            panel.Children.Add(button2);
        }
    }
}