public override void InitializeOnceAtStartup()
        {
            base.InitializeOnceAtStartup();

            CameraViewWindowModel.InitializeOnceAtStartup(base.Device);
            SettingsWindow.InitializeOnceAtStartup(this);
            CameraViewWindow.InitializeOnceAtStartup(CameraViewWindowModel, CameraViewUserControlModel);

            AppTrayIconAndMenuItems.InitializeOnceAtStartup(this);

            CameraViewWindowModel.SettingsCommand.PerformEventHandler += (sender, e) =>
            {
                SettingsWindow.ToggleVisibility();
            };
            CameraViewWindowModel.ExitCommand.PerformEventHandler += (sender, e) =>
            {
                if (false)
                {
                    var message = string.Format(CultureInfo.InvariantCulture, Resources.CommonStrings_WouldYouExitApplication0, ApplicationCommonSettings.HostApplicationName);
                    if (MessageBox.Show(message, Resources.CommonStrings_Confirmation, MessageBoxButton.OKCancel) != MessageBoxResult.OK)
                    {
                        return;
                    }
                }
                this.Dispose();
            };

            // do nothing
            CameraViewWindowModel.CanDragMoveChanged += delegate { };
            CameraViewWindowModel.CanResizeChanged   += delegate { OnCanResizeCameraViewWindowChanged(); };
            OnCanResizeCameraViewWindowChanged();

            Device.IsHidDeviceConnectedChanged += Device_IsHidDeviceConnectedChanged;
            // NOTE: Update is necessary here, too.
            if (ApplicationCommonSettings.IsInternalRelease)
            {
                UpdateDeviceFirmwareCommand.CanPerform = Device.IsHidDeviceConnected ? true : false;
            }

            CultureInfoAndDescription.ValueUpdated += delegate
            {
                SettingsWindow.ReloadDataContext();
                CameraViewWindow.ReloadDataContext();
            };

            if (false)
            {
                CameraViewWindow.Closed += delegate
                {
                    if (IsToDisposeThisWhenCameraViewWindowClosed)
                    {
                        CameraViewWindow = null;
                        // TODO: MUSTDO: Application does not exit, if users click "close window" on the icon of CameraView on the task bar!!
                        this.Dispose();
                    }
                };
            }

            if (ApplicationCommonSettings.IsDebugging)
            {
                SettingsWindow.Show();
            }
            IsToDisposeThisWhenCameraViewWindowClosed = true;
        }