Customizing the metamodel : What you can do with USRPROPS/SAPROPS : Layout capabilities : Grids, list and text boxes : Grids
  
Grids
Grids may be enabled in dialog menus by using the ASGRID command. The grid enables users to view and edit an item’s properties on one screen. Users may edit properties directly on the grid, or select an item and click Define to open the item’s full definition.
The grid presents all of the underlying properties to an item except for text properties greater than 100 characters: the user needs to open the full definition to access such properties.
Dialogs with grids in them will take a little longer to open than other dialogs, because the grid presents the actual definition of each item. For example, when you open the definition of a class with 30 methods, System Architect is opening and making available to edit all 30 methods.