Customizing the metamodel : What you can do with USRPROPS/SAPROPS : Layout capabilities : Grids, list and text boxes : Zoomable list boxes
  
Zoomable list boxes
A Zoomable Text or List Box contains a button control in its lower-right-hand corner that enables the box to be expanded or contracted by the user, to reveal more or less of its contents. The button control has a plus sign in it when the box is not zoomed, and a minus sign when it is zoomed.
To create a Zoomable Text or List Box, the ZOOMABLE command is applied to a text or list box property.
Example 1: Zoomable Text Box, Default Length
DEFINITION "Process" { PROPERTY "Description" { ZOOMABLE } }
Example 2: Zoomable Text Box of Specific Length
PROPERTY "VB Constants" { ZOOMABLE EDIT Text LENGTH 32767 LABEL "Constants" HELP "Constants local to this class"}
Example 3: Zoomable OneOf Box
PROPERTY "Object" { ZOOMABLE EDIT OneOf "IDEF3 Object" }
Example 4: Zoomable ListOf Box
PROPERTY "Fields" { ZOOMABLE EDIT ListOf "Data" LENGTH 2000 }