TComboBoxEx的小问题

Question

{请问怎么可以取到TComboBoxEx的值，前提是只能从下拉的中选那种方式.
TComboBoxEx取不出，但TComboBox却能取出}
unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls;type
  TForm1 = class(TForm)
    aa: TComboBoxEx;
    Button1: TButton;
    bb: TComboBox;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage((Self.FindChildControl('aa') as TComboBoxEx).Text);
ShowMessage((Self.FindChildControl('bb')as TComboBox).Text);
end;end.

Answer 1

procedure TForm1.ComboBoxEx1Change(Sender: TObject);
begin
  showMessage(ComboBoxEx1.Items.Strings[ComboBoxEx1.ItemIndex]);
end;Style設定:csExDropDownList