Delphi 内嵌网页窗口大小

程序里放置一个WebBrowser（在Internet页面里）然后：
procedure TForm1.Button1Click(Sender: TObject);
begin
  WebBrowser1.Navigate('http://www.baidu.com');
end;
请问一下如何控制这个内嵌网页的大小是100%
随窗口的大小而变化

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什么意思，设置
WebBrowser的aligne为alclient

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简单的说就是让delphi中控件的宽度、高度使用百分比
object Form1: TForm1
  Left = 216
  Top = 161
  Width = 870
  Height = 640
  Caption = 'Form1'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  OnCreate = FormCreate
  PixelsPerInch = 96
  TextHeight = 13
  object WebBrowser1: TWebBrowser
    Left = 0
    Top = 0
    Width = 849 ======这两个地方的宽度和高度都设置成100%
    Height = 529 ======100%
    TabOrder = 0
    ControlData = {
      4C000000BF570000AC3600000000000000000000000000000000000000000000
      000000004C000000000000000000000001000000E0D057007335CF11AE690800
      2B2E126208000000000000004C0000000114020000000000C0000000000