In beta7 we have added the ability to specify a BROWSE command that will be rendered in a custom section. You specify the command in the "Attributes" dialog for the custom section. e.g.

BROWSE NOEDIT KEY customers.custid FIELDS date=date(),currencycode:H="Code",name
Note how you can use the KEY clause. This can be used to cause the BROWSE grid to change dynamically as data in the parent of the custom section changes.