[Lazarus] TListBox.AddItem doesn't exist?

[Timothy Groves]

So I am trying to add a TListBox to my program.  Relevant code is below.
  TfrmFicMake = class(TForm)
    .
    .
    .
    lstVolumeList: TListBox;
    .
    .
    .
  end;

procedure TfrmFicMake.btnAddVolumeClick(Sender: TObject);
var
  index : integer;
begin
  frmCreateVolume.ShowModal;
  lstVolumeList.Clear;
  for index := 0 to (Length (Volumes) - 1) do
      lstVolumeList.AddItem (Volumes [index].VolumeName);
end;



When I try to compile this, I get:

mainform.pas(55,18) Error: identifier idents no member "AddItem"


Now, I am almost certain, based on having perused the documentation, 
that TListBox contains a method called AddItem.  What am I doing wrong?

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