I am trying to download files in the editor itself. However I am getting nothing from it.

Here is my js code so far

class MyTestWindow extends EditorWindow {
    var myString : String;

    @MenuItem ("MyTestWindow/Check For Updates")
    static function Init () {

        var window : MyTestWindow = EditorWindow.GetWindow (MyTestWindow);
        window.Show ();
    }

    function OnGUI () {
        EditorGUILayout.TextArea(myString, GUILayout.ExpandWidth(true), GUILayout.ExpandHeight(true));
    }

    function GetPage()
    {
        var www : WWW = new WWW("http://google.com");
        yield www;
        myString = www.data;
    }
}

Thank you