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Open ComboBox from other control - Components - Tips & Tricks - Greatis Delphi Pages
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;
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Setting ListBox font
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