private void add_gesture_btn_Click(object sender, RoutedEventArgs e)
        {
            // open add window
            GestureConfigWin add_win = new GestureConfigWin();

            if (add_win.ShowDialog().Value == true)
            {
                gesture_recognizer.AddGestureConfig(add_win.new_gesture_config);

                // update list
                UpdateGestureComboBox();
                // update status bar
                statusbarLabel.Content = "Add gesture: " + add_win.new_gesture_config.name;
            }
        }
        private void add_gesture_btn_Click(object sender, RoutedEventArgs e)
        {
            // open add window
            GestureConfigWin add_win = new GestureConfigWin();
            if (add_win.ShowDialog().Value == true)
            {
                gesture_recognizer.AddGestureConfig(add_win.new_gesture_config);

                // update list
                UpdateGestureComboBox();
                // update status bar
                statusbarLabel.Content = "Add gesture: " + add_win.new_gesture_config.name;
            }
        }