To display the Preview view of a DataWindow object open
in the DataWindow painter:

1. If the Preview view is not already displayed,
   select View>Preview from the menu bar.

   In the Preview view, the bars that indicate the bands do not
   display, and, if you selected Retrieve on Preview in the DataWindow wizard, PowerBuilder retrieves
   all the rows from the database. You are prompted to supply arguments
   if you defined retrieval arguments.

   In external DataWindow objects

   If the DataWindow object uses the External data source, no data is retrieved.
   You can import data, as described in “Importing data into a DataWindow object”.

   In DataWindow objects that have stored data

   If the DataWindow object has stored data in it, no data is retrieved
   from the database.

   As the rows are being retrieved, the Retrieve button in the toolbarPainterBar
   changes to a Cancel button. You can click the Cancel button to stop
   the retrieval.

2. Test your DataWindow object.

   For example, modify some data, update the database, re-retrieve
   rows, and so on, as described below.