>I would like to have an integrated Query Builder in my app

Take a look at Stonefield Query. It's an object-oriented querying tool that you can add to any VFP app. It can talk to any VFP data (tables in a DBC or free tables) and non-VFP data (via ODBC) such as SQL Server or Access. It's royalty-free and comes with a 60-day money back guarantee. More information (including documentation) and a downloadable demo are available from Stonefield's Web site.

Doug