#95585# Made shape tree reference passed to constructor const.  Added implementation of getAccessibleAt.
#95585# Made shape tree reference passed to constructor const.  Added implementation of getAccessibleAt.

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core