>how to add a grid's custom property?

Oh, I see. You have to have a grid class, instead of using the base VFP grid. To do this, put a grid on a form, set any properties that you would like to be common in your grid's, click on the grid to select it, and go to File... Save As Class. Name your class grdBase or something like that, and specify a VCX to store you class in. If you don't have a bse classes vcx yet, you can type one in that doesn't exist. Once you have a grid class, you can modify that class and add a custom property to it much the same way that you add a custom property to your forms.

It will probably help to read the help file under subjects on "Classes"