refresh trouble gwt

Hello,
You can see the solution in the sources of the gwt showcase.
In the showcase you can see how to simulate history changes
focus on this part of code

Code:

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 final HistoryListener historyListener = new HistoryListener() {
      public void onHistoryChanged(String historyToken) {
        TreeItem item = itemTokens.get(historyToken);
        if (item == null) {
          item = app.getMainMenu().getItem(0).getChild(0);
        }
 
        // Select the associated TreeItem
        app.getMainMenu().setSelectedItem(item, false);
        app.getMainMenu().ensureSelectedItemVisible();
 
        // Show the associated ContentWidget
        displayContentWidget(itemWidgets.get(item));
      }
    };
    History.addHistoryListener(historyListener);

Hope this helps