Use this event to save the report to a stream instead of a file. If you assign OnGetOutStream, FlexCel won't generate a file, it doesn't matter if you define filenameUCustomFlexCelReport.TCustomFlexCelReport.FileName or not. Instead, the results will be saved to the stream you specify on this event, by setting the variable OutStream. 

Note that is normally easier to call TCustomFlexCelReport.SaveToStream directly, and not using this event. 

TCustomFlexCelReport Events