popup window in grid view (update pannel)

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C#

C#4.0

ASP.NET4

I have grid view in update panel,
grid view have a link button now i want to open a new window



I try this by using:

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        string javaScript =
            "<script language=JavaScript>\n" +
            "window.open('Default2.aspx','_blank','resizable=no,height=275,width=550,left=500,top=350');\n" +
            "</script>";


        if (!ClientScript.IsStartupScriptRegistered("JSScript"))
        {
            ClientScript.RegisterStartupScript(this.GetType(), "JSScript", javaScript.ToString());
        }

        //Page.RegisterStartupScript("Page_Load", javaScript);

      //  ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "AddOnLife", javaScript, false);

      //ScriptManager.RegisterClientScriptBlock(updpnlHold er,typeof(UpdatePanel), "AddOnLife", code, true);
    }

BUt it doesn't work