| xlSheetHidden |
| xlSheetVeryHidden |
| xlSheetVisible |
Workbook.Sheets[1].Visible := False;
Workbook.Sheets[1].Visible := xlSheetHidden;
With Workbook.Sheets[1] do begin
if Visible = xlSheetVisible then
Name := 'Visible Sheet'
else
Name := 'InVisible Sheet';
end;