if(!(TR_AddClass(NULL,TRGR_Horiz,TROB_DisplayObject,(TR_Method)(TRDP_Group),sizeof(struct TROD_Group),NULL)))
  goto failed;
if(!(TR_AddClass(NULL,TRGR_Vert,TROB_DisplayObject,(TR_Method)(TRDP_Group),sizeof(struct TROD_Group),NULL)))
  goto failed;
