export document of pictures to jpeg disables message box

edited 9:29AM in FastReport .NET
hello to all
i built reports using c# and exported the document into jpeg
when running FReport.Prepare(false); a window pops up that i dont want to see on screen and i want that allk the export process would run in the background/
how do i disable the blinking while building the document?

thank you for your help

shalom

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