...get the Handle of a ComboBox List?

  private
    { Private declarations }
    procedure ComboBoxMessage(var Msg: TMessage); message WM_USER;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function EnumProc(wnd: HWND; Alabel: TLabel): BOOL; stdcall;
var
  buffer: array[0..50] of Char;
begin
  Result := True;
  if IsWindowVisible(wnd) then
  begin
    GetClassName(wnd, buffer, SizeOf(buffer));
    if StrIComp(buffer, 'ComboLBox') = 0 then
    begin
      Alabel.Caption := Format('handle found: %x', [wnd]);
      Result := False;
    end;
  end;
end;

procedure TForm1.ComboBoxMessage(var Msg: TMessage);
begin
  EnumThreadWindows(GetCurrentThreadID, @EnumProc, Integer(label1));
end;

procedure TForm1.ComboBox1DropDown(Sender: TObject);
begin
  PostMessage(Handle, WM_USER, 0, 0);
end;

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