public void CopyImageMetadataToWholeBook(Metadata metadata)
 {
     using (var dlg = new ProgressDialogForeground())            //REVIEW: this foreground dialog has known problems in other contexts... it was used here because of its ability to handle exceptions well. TODO: make the background one handle exceptions well
     {
         dlg.ShowAndDoWork(progress => CurrentBook.CopyImageMetadataToWholeBookAndSave(metadata, progress));
     }
 }