在HTML中<Head></head>加入中加入下面的代码
<OBJECT id="MaxButton" type="application/x-oleobject" classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11"
VIEWASTEXT>
<PARAM NAME="Width" VALUE="106">
<PARAM NAME="Height" VALUE="53">
<PARAM NAME="Command" VALUE="Maximize">
</OBJECT>
然后在Page_Load()事件中加入下面的代码
this.Page.RegisterStartupScript("onclick","<script language=javascript>MaxButton.Click()</script>");