Werte in Combobox einfügen klappt so nicht

[Popov]

Delphi-Quellcode:

  Combobox3.Items.Add('37');
  ComboBox3.ItemIndex := Combobox3.Items.IndexOf('37');

oder

Delphi-Quellcode:

  with Combobox3 do
  begin
    Items.Clear;
    Items.Add('37');
    ItemIndex := Items.IndexOf('37');
    //ItemIndex := Items.IndexOf(Trim(Items.Text));
  end;

oder

Delphi-Quellcode:

  with Combobox3 do
  begin
    Items.Clear;
    ItemIndex := Items.Add('37');
  end;