protected void index_SelectedHelpFileChanged(object sender, EventArgs e)
        {
            if (!changingSelection)
            {
                changingSelection = true;
                ContentsSelected  = false;

                DocSiteNavigator.NavigateToHelpFile(index.SelectedHelpFile);

                contents.SelectedTopic = DocSiteNavigator.ResolveHelpFileTopic(index.SelectedHelpFile, false);

                changingSelection = false;
            }
        }