DXImagelist > LoadFromFile & SaveToFile

[Smok]

I want to create simple tile-package editor. It has to load pictures into DXImageList, and save them into one file.

I was trying to do such thing:

procedure TForm1.FormCreate(Sender: TObject);
var i:integer;
begin
if FileExists('test.gfx') then
  IL.Items.LoadFromFile('test.gfx');
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
IL.Items.SaveToFile('test.gfx');
end;

procedure TForm1.Button1Click(Sender: TObject);
var
 Item: TPictureCollectionItem;
 picture : TPicture;
begin
if openDlg.Execute then
  begin
  picture := TPicture.Create;
  picture.LoadFromFile(openDlg.Filename);
  try
    Item := TPictureCollectionItem.Create(IL.Items);
    Item.Picture.Graphic := picture.Graphic;
    Item.Name:=InputBox('Name','Name:','');
    Item.Restore;
  finally
   picture.Free;
  end;
 end;
end;

But package files never get saved or loaded. (I've got images in imagelist, cause I can draw them).

This SaveToFile works only when I add images to component (before running application). After such save it is possible to load these images back to component.

I don't know to add or replace image. Deleting existing images works fine.

How can I dynamically add images _and_ save them?