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Frequently Asked Questions

Dropping a combobox's list in code.

Question:

How do I get a ComboBox to drop down its list box in code?

Answer:

Send the ComboBox a CB_SHOWDROPDOWN message, passing a 1 (true) in
the WParam parameter to drop the list down, or a 0 (false) to hide it.

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

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