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How to programatically dropdown a TComboBox

Title: How to programatically dropdown a TComboBox procedure TForm1.Button1Click(Sender: TObject); begin // Check whether DropedDown if SendMessage(ComboBox1.Handle, CB_GETDROPPEDSTATE, 0, 0) 1 then // nop, so drop it SendMessage(ComboBox1.Handle, CB_SHOWDROPDOWN, 1, 0); end;