How to Create webbrowser control within thread

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C#3.0

C#

Dear,
I am suffering from one problem using Webbrowser control in form. i have placed one webbrowser control on it. when ever some button gets clicked in that browser, the form stuck somewhat, so it is very irritating. so i have decided that i will create webbrowser control in thread, and will do all the webbrowser process in that thread. but when i go through this code. then document completed event does not fire. just take a look at.

public partial class Form1 : Form
    {
        WebBrowser webbrowser;
        Thread t;
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            t = new Thread(StartBrowser);
            t.SetApartmentState(ApartmentState.STA);
            t.Start();
           
        }
        void StartBrowser()
        {
            webbrowser = new WebBrowser();
            webbrowser.DocumentCompleted+=new WebBrowserDocumentCompletedEventHandler(webbrowser_DocumentCompleted);
            webbrowser.Navigate("www.google.com");
        }
        void webbrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        { // i have put break point here/////////
        }
    }

Please give me suggestions.

Thank you very much.