asp.net facebook graph tool kit for getting small login window

I have asp.net with facebook integrated application external. When i post a message it is asking FB login window. All are working fine. Now the FB login window show as maximized screeen . I want to show it as a small one.

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protected void ImgButtonWish_Click(object sender, ImageClickEventArgs e)

{

Session["wishmessage"] = txtWish.Text; RedirectToFacebookAuthorization(); // Response.Redirect(https://www.facebook.com/dialog/oauth?client_id=281602828531030&redirect_uri=index.aspx);

}

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protected void Page_Load(object sender, EventArgs e)

{

if (!IsPostBack) {

if (Request["code"] != null)

{

string authorizationCode = Request["code"];

if (Session["journymessage"] != null)

}