public void SelectAdjacentFace()
 {
     if (m_selected_face > -1)
     {
         m_selected_face = m_active_dmesh.GetFirstAdjacentFace(m_selected_face);
         BuildDecalSelected(m_active_dmesh, m_selected_face);
         this.Refresh();
         UpdateFaceCheckListFromSelected();
     }
 }