@Override
   public Dialog onCreateDialog(final Bundle savedInstanceState) {
      // the content
      final RelativeLayout root = new RelativeLayout(getActivity());
      root.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
      // creating the fullscreen dialog
      final Dialog dialog = new Dialog(getActivity());
      dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
      dialog.setContentView(root);
      dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.WHITE));
      dialog.getWindow().setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
      return dialog;
   }