dbgrid.width on different monitors

I designed the columns of a dbgrid to fit exactly within the width of the
dbgrid (so there won't be any horisontal scrollbar). When installing the app
on my client's computer, the columns are too wide for the grid, and the
horisontal scrollbar is visible. How can I ensure that the total with of the
columns will fit the grid (on different monitors)?

Thanks a lot for any suggestrions,