Get the minimum and maximum value for column HEIGHT. 
   rc=clearlist(gattr);
   gattr=setnitemc(gattr,'height','name');
   gattr=setnitemn(gattr,.,'minvalue');
   gattr=setnitemn(gattr,.,'maxvalue');
   call send(tabid,'_getColumnAttributes',
             gattr);
   call putlist(gattr,'Min & Max values of column HEIGHT=',0);
   rc=dellist(gattr);
return;