If I understand your question correctly, you can use the form's Resize event to change the size of a grid on the form. For instance, put this in the form's resize event:

THIS.Lockscreen=.T.
THIS.grdMyGrid.Width=THIS.Width-14
THIS.grdMyGrid.Column2.Width=THIS.grdMyGrid.Width-85
THIS.Lockscreen=.F.

This changes the grid to be 14 pixels narrower than the current width of the form. It also adjusts the width of one column relative to the width of the grid. You could adjust all of the columns, but frequently there's really only one or two that need to stretch when the form is resized.

>Special thanks to Jess Banaga .. the problem solve already
>
>BTW can you change the border's size of the form including the Grid control, BorderStyle=3 - sizeable setted. ?