Created wrapper for handling the Application Launcher buttons.
Created wrapper for handling the Application Launcher buttons.

--- /dev/null
+++ b/KerbalEngineer/AppLauncherButton.cs
@@ -1,1 +1,162 @@
+// 
+//     Kerbal Engineer Redux
+// 
+//     Copyright (C) 2016 CYBUTEK
+// 
+//     This program is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as published by
+//     the Free Software Foundation, either version 3 of the License, or
+//     (at your option) any later version.
+// 
+//     This program is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//     You should have received a copy of the GNU General Public License
+//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//  
 
+namespace KerbalEngineer
+{
+    using KSP.UI.Screens;
+    using UnityEngine;
+
+    public class AppLauncherButton : MonoBehaviour
+    {
+        public enum ButtonState
+        {
+            Disabled,
+            On,
+            Off
+        }
+
+        private ApplicationLauncherButton m_Button;
+
+        /// <summary>
+        ///     Sets the state of the button.
+        /// </summary>
+        public void SetState(ButtonState state)
+        {
+            if (m_Button == null)
+            {
+                return;
+            }
+
+            switch (state)
+            {
+                case ButtonState.Disabled:
+                    Disable();
+                    break;
+
+                case ButtonState.On:
+                    Enable();
+                    m_Button.SetTrue();
+                    break;
+
+                case ButtonState.Off:
+                    Enable();
+                    m_Button.SetFalse();
+                    break;
+            }
+        }
+
+        protected virtual void Awake()
+        {
+            // subscribe event listeners
+            GameEvents.onGUIApplicationLauncherReady.Add(OnGUIApplicationLauncherReady);
+            GameEvents.onGUIApplicationLauncherUnreadifying.Add(OnGUIApplicationLauncherUnreadifying);
+        }
+
+        protected virtual void OnDestroy()
+        {
+            // unsubscribe event listeners
+            GameEvents.onGUIApplicationLauncherReady.Remove(OnGUIApplicationLauncherReady);
+            GameEvents.onGUIApplicationLauncherUnreadifying.Remove(OnGUIApplicationLauncherUnreadifying);
+        }
+
+        /// <summary>
+        ///     Called on button being disabled.
+        /// </summary>
+        protected virtual void OnDisable() { }
+
+        /// <summary>
+        ///     Called on button being enabled.
+        /// </summary>
+        protected virtual void OnEnable() { }
+
+        /// <summary>
+        ///     Called on button being toggled off.
+        /// </summary>
+        protected virtual void OnFalse() { }
+
+        /// <summary>
+        ///     Called on mouse hovering.
+        /// </summary>
+        protected virtual void OnHover() { }
+
+        /// <summary>
+        ///     Called on mouse exiting hover.
+        /// </summary>
+        protected virtual void OnHoverOut() { }
+
+        /// <summary>
+        ///     Called on button being ready.
+        /// </summary>
+        protected virtual void OnReady() { }
+
+        /// <summary>
+        ///     Called after the application launcher is ready and the button created.
+        /// </summary>
+        protected virtual void OnTrue() { }
+
+        /// <summary>
+        ///     Called after the application launcher is unreadified and the button removed.
+        /// </summary>
+        protected virtual void OnUnreadifying() { }
+
+        /// <summary>
+        ///     Disables the button if not already disabled.
+        /// </summary>
+        private void Disable()
+        {
+            if (m_Button != null && m_Button.toggleButton.Button.interactable)
+            {
+                m_Button.Disable();
+            }
+        }
+
+        /// <summary>
+        ///     Enables the button if not already enabled.
+        /// </summary>
+        private void Enable()
+        {
+            if (m_Button != null && m_Button.toggleButton.Button.interactable == false)
+            {
+                m_Button.Enable();
+            }
+        }
+
+        private void OnGUIApplicationLauncherReady()
+        {
+            // create button
+            if (ApplicationLauncher.Instance != null)
+            {
+                Texture iconTexture = GameDatabase.Instance.GetTexture("KerbalEngineer/Textures/ToolbarIcon", false);
+                m_Button = ApplicationLauncher.Instance.AddModApplication(OnTrue, OnFalse, OnHover, OnHoverOut, OnEnable, OnDisable, ApplicationLauncher.AppScenes.ALWAYS, iconTexture);
+            }
+
+            OnReady();
+        }
+
+        private void OnGUIApplicationLauncherUnreadifying(GameScenes scene)
+        {
+            // remove button
+            if (ApplicationLauncher.Instance != null && m_Button != null)
+            {
+                ApplicationLauncher.Instance.RemoveModApplication(m_Button);
+            }
+
+            OnUnreadifying();
+        }
+    }
+}