Seltsames Problem bei TListView Checkboxen

[stockholm]

Nabend,

folgender Code funktioniert 1a bei der lstBooks, aber die lstBookItems bleibt vollkommen unberührt.

Delphi-Quellcode:

procedure TfrmMain.CheckBox2Click(Sender: TObject);
var
 i: integer;
begin

 for i := 0 to lstBooks.Items.Count-1 do
 lstBooks.Items[i].Checked := CheckBox2.Checked;
 refreshBooks(self);

end;

procedure TfrmMain.CheckBox3Click(Sender: TObject);
var
 i: integer;
begin
 for i := 0 to lstBookItems.Items.Count-1 do
 lstBookItems.Items[i].Checked := CheckBox3.Checked;
 refreshBooks(self);
end;

Ich hoffe das ist irgendein Fehler, den ich einfach übersehe weil ich kaputt bin.

Hier das DFM dazu...

Delphi-Quellcode:

      object lstBookItems: TListView
        Left = 243
        Top = 50
        Width = 537
        Height = 352
        Anchors = [akLeft, akTop, akRight, akBottom]
        Checkboxes = True
        Columns = <
          item
            Caption = 'test'
            Width = 200
          end
          item
            Caption = 'test1'
            Width = 150
          end
          item
            Caption = 'test2'
            Width = 140
          end>
        ColumnClick = False
        GridLines = True
        ReadOnly = True
        RowSelect = True
        SmallImages = imgSmall
        TabOrder = 0
        ViewStyle = vsReport
      end
      object lstBooks: TListView
        Left = 26
        Top = 50
        Width = 211
        Height = 352
        Anchors = [akLeft, akTop, akBottom]
        Checkboxes = True
        Columns = <
          item
            Caption = 'test0'
            Width = 186
          end>
        ColumnClick = False
        GridLines = True
        ReadOnly = True
        RowSelect = True
        SmallImages = imgSmall
        TabOrder = 1
        ViewStyle = vsReport
        OnClick = refreshTest
      end

Danke!