private void OnGUI()
        {
            using (GUI.AlignBlock.Center)
                GUILayout.Box(IconManager.GetAGXUnityLogo(),
                              GUI.Skin.customStyles[3],
                              GUILayout.Width(400),
                              GUILayout.Height(100));

            EditorGUILayout.LabelField("© " + System.DateTime.Now.Year + " Algoryx Simulation AB",
                                       InspectorEditor.Skin.LabelMiddleCenter);

            InspectorGUI.BrandSeparator(1, 6);

            var agxLfxColor       = Color.Lerp(Color.green, Color.black, 0.35f);
            var encryptedFilename = $"agx{AGXUnity.LicenseManager.GetRuntimeActivationExtension()}".Color(agxLfxColor);
            var serviceFilename   = $"agx{AGXUnity.LicenseManager.GetLicenseExtension( AGXUnity.LicenseInfo.LicenseType.Service )}".Color(agxLfxColor);

            InspectorGUI.ToolDescription("Generate an AGX Dynamics for Unity runtime activation file containing " +
                                         "encrypted License Id and Activation Code bound to the application. The " +
                                         "generated runtime activation file (" + encryptedFilename + ") will be replaced " +
                                         "with a hardware locked " + serviceFilename + " if the activation is successful.\n\n" +
                                         "<b>Internet access is required during the activation on the target hardware.</b>");

            InspectorGUI.Separator(1, 6);

            InspectorGUI.SelectFolder(GUI.MakeLabel("Build directory"),
                                      BuildDirectory,
                                      "Build directory",
                                      newBuildDirectory =>
            {
                if (!Directory.Exists(newBuildDirectory))
                {
                    Debug.LogWarning($"Ignoring given build path {newBuildDirectory} doesn't exist.");
                    return;
                }
                BuildDirectory = newBuildDirectory;
                // Reset reference file if it doesn't exist in the new build directory hierarchy.
                if (!File.Exists(ReferenceFileInBuildFull))
                {
                    m_referenceFileInBuild = string.Empty;
                }
            });
            InspectorGUI.SelectFile(GUI.MakeLabel("Reference file"),
                                    ReferenceFileInBuild,
                                    "Select reference file in build",
                                    BuildDirectory,
                                    newFilename =>
            {
                ReferenceFileInBuild = newFilename;
            });

            m_idPassword.Id = EditorGUILayout.TextField(GUI.MakeLabel("Runtime License Id"),
                                                        m_idPassword.Id,
                                                        InspectorEditor.Skin.TextField);
            if (m_idPassword.Id.Any(c => !char.IsDigit(c)))
            {
                m_idPassword.Id = new string( m_idPassword.Id.Where(c => char.IsDigit(c)).ToArray());
            }
            m_idPassword.Password = EditorGUILayout.PasswordField(GUI.MakeLabel("Runtime Activation Code"),
                                                                  m_idPassword.Password);

            var generateToolTip = string.Empty;

            using (new GUI.EnabledBlock(ValidateGenerate(ref generateToolTip))) {
                GUILayout.Space(3);
                if (GUILayout.Button(GUI.MakeLabel("Generate", false, generateToolTip)))
                {
                    var generatedFilename = string.Empty;
                    if (AGXUnity.LicenseManager.GenerateEncryptedRuntime(System.Convert.ToInt32(m_idPassword.Id),
                                                                         m_idPassword.Password,
                                                                         BuildDirectory,
                                                                         ReferenceFileInBuild,
                                                                         filename => generatedFilename = filename))
                    {
                        EditorUtility.DisplayDialog("Encrypted Runtime License",
                                                    $"Encrypted runtime successfully written to: {generatedFilename}",
                                                    "Ok");
                        Close();
                    }
                }
            }
        }