export document of pictures to jpeg disables message box

edited 1:44PM 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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Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.