void OpenMapEditor()
        {
            if (m_subWindow != null)
            {
                m_subWindow.Close();
            }

            if (m_subWindow == null)
            {
                m_subWindow = MapEditorSub.WillAppear(this);
            }
            else
            {
                m_subWindow.Focus();
            }
            m_subWindow.Init();

            AssetDatabase.Refresh();
        }