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Use SendMessage function with CB_SHOWDROPDOWN message, if you want to show list box of a combo box.

procedure TForm1.Button1Click(Sender: TObject);
begin
  SendMessage(ComboBox1.Handle, CB_SHOWDROPDOWN, 1, 0);
end;

Related chapters

Fonts

Related topics

Setting ListBox font
Scroll a Memo
Get Memo current line

For more

Win32 Programmer's reference

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