What you want is commonly called drill down. You could do it with the VFP grid control. Double click on a row and either a child window pops up with the invoice information or a second grid is filled with the details.

>When I say saveral layer grid, I mean a grid that has several related files.
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>For example a list of customers, when you click on a given customer it will show all of their invoices, and whne you click on one of those invoices it will show all of the lines of that invoice.
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>The application I am tryingto do is more complicated than hat, but I think the several layer grid would be helpful.