procedure TComLocateFrm.LocateBtnClick(Sender: TObject);
var
   setLoOptions : TLocateOptions;
   i : integer;
   slKeys : TStrings;
begin

  if ComboBox1.Items.IndexOf(ComboBox1.Text)<0 then
  try
    slKeys := TStringList.Create;
    slKeys.AddStrings(ComboBox1.Items);
    ComboBox1.Items.Clear;
    ComboBox1.Items.Add(ComboBox1.Text);
    for i := 0 to 8 do
      if i < slKeys.Count then
        ComboBox1.Items.Add(slKeys.Strings[i]);
  finally
     slKeys.Free;
  end
  else begin
    i := ComboBox1.Items.IndexOf(ComboBox1.Text);
    ComboBox1.Items.Insert(0,ComboBox1.Text);
    ComboBox1.Items.Delete(i+1);
    ComboBox1.ItemIndex := 0;
  end;

  if rdoExactly.Checked then
     setLoOptions := []
  else
     setLoOptions := [loPartialKey];
  if Not DesDataSet.Locate('ZTM', ComboBox1.Text, setLoOptions) then
     MessageBox(Handle, '没有找到符合条件的记录。', '提示', 0+64);
end;