Set the second column to use center horizontal justification. The second column to be set up is column number 5.
call send(gddvecid, '_setIndex', 2);
collst2 = makelist();
rc = insertn(collst2, 5, -1);
call send(gddvecid, '_setColumn', collst2);
call send(gddvecid, '_setHjust', 'center');