protected internal override void ExecuteDefaultAction(EventBase evt)
            {
                base.ExecuteDefaultAction(evt);

                if ((evt as MouseDownEvent)?.button == (int)MouseButton.LeftMouse)
                {
                    m_ObjectField.ShowObjectSelector();
                }
            }
 private void OnKeyboardEnter()
 {
     m_ObjectField.ShowObjectSelector();
 }