Data stored in a DataWindow object is stored within the actual object itself, so when a window opens showing such a DataWindow, the data is already there. There is no need to issue Retrieve to get the data.
PowerBuilder never retrieves data into a drop-down DataWindow that already contains data. For all other DataWindow objects, if you retrieve data into a DataWindow object stored with data, PowerBuilder handles it the same as a DataWindow object that is not stored with data: PowerBuilder gets the latest data by retrieving rows from the database.