How does one have a grid set to a customerBO that when he double clicks a row in the grid it opens the maintenance window with that record ready for editing.

To accomplish that task, you use the ChildFormDialog component.  When the grid record is double-clicked, simply Navigate() the business object to that record and then call ChildFormDialog.ShowDialog() to show the maintenance form and edit the customer record.  There is a sample of how to configure a ChildFormDialog within the Samples folder in the StrataFrame program group in the Start Menu.  The sample is C# only, I believe.