WinStudio
Use the Collection property to specify the source of a collection of data for a form. The value of the property is the name of an IDO.
The property applies to primary and secondary collections.
NOTE: For forms created as extensions of existing forms, if the base form already has an IDO collection specified, you cannot change or add this property. If the base form does not have any collection specified, then you can add a collection using this property
About Creating New Forms by Extension