static void InsertText_cb(IntPtr inst, IntPtr str1ng, int length, ref int position)
 {
     try {
         IEditableTextImplementor __obj = GLib.Object.GetObject(inst, false) as IEditableTextImplementor;
         __obj.InsertText(GLib.Marshaller.Utf8PtrToString(str1ng), ref position);
     } catch (Exception e) {
         GLib.ExceptionManager.RaiseUnhandledException(e, false);
     }
 }