TAdvGridExcelIO canst LoadFrom file

I want import in  FExcelIO: TAdvGridExcelIO; component *.xls file with 7 sheets. how do this right?
methot  FExcelIO.XLSImport(aFileName); - work in only in visual component and I noticed that the component works differently with the dynamic creation of. 

Example:
procedure TForm1.btn1Click(Sender: TObject);
var
  FExcelIO: TAdvGridExcelIO;
begin
  FExcelIO := TAdvGridExcelIO.Create(nil);
  FExcelIO.XLSImport('d:\xxx.xls');
  FExcelIO.AdvGridWorkbook := advgrdwrkbk1;
end;
Lead to error: "Exception with message 'There is no AdvStringGrid assigned to this component'."


I write this function but I'm not sure that I did everything right. 

procedure TAdvSpreadBook.LoadFromFile(const aFileName: string);
var
  i: Integer;
  G: TAdvSpreadGrid;
begin
  FExcelIO.XLSImport(aFileName);
  exit;

  while FPageControl.PageCount > 0 do
    FPageControl.Pages[0].Free;

  FExcelIO.LoadSheetNames(aFileName);

  for I := 0 to FExcelIO.SheetNamesCount - 1 do
  begin
    G := NewGrid(FExcelIO.SheetNames);

    FExcelIO.AdvStringGrid := G;
    FExcelIO.XLSImport(aFileName);
  end;
end;

procedure TAdvSpreadBook.SaveToFile(const aFileName: string);
var
  i: Integer;
begin
 for I := 0 to FExcelIO.SheetNamesCount -1 do
 begin
   FExcelIO.AdvStringGrid := GetGrids(I);
   FExcelIO.XLSExport(aFileName, FExcelIO.SheetNames);
 end;
end;

If you use TAdvStringGrid, you'll indeed need to loop through all sheets and import sheet per sheet by using the sheetname parameter in the XLSImport() call.
When you use a TAdvGridWorkbook that you assign to TAdvGridExcelIO.AdvGridWorkbook, then TAdvGridExcelIO should do this automatically for you.

ok thanks