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Check if ComboBox is dropped down

Title: Check if ComboBox is dropped down Use SendMessage function with CB_GETDROPPEDSTATE message. If Result is true, then the list box of ComboBox is dropped down. You may send this message every second by using Timer component. procedure TForm1.Timer1Timer(Sender: TObject); begin if SendMessage(ComboBox1.Handle,CB_GETDROPPEDSTATE,0,0)=1 then Caption:='ComboBox is opened' else Caption:='ComboBox is closed'; end;