VS 2010 problem with negative numbers in datagridview when RightToLeft=True

hi

in my program there is a datagridview.i set its RightToLeft property to TRUE . so when i input a negative number in the cells the negative sign is shown in the end of the number.for example :

i input -123 ----> shown : 123-

what can i do for fix this problem whereas RightToLeft = TRUE