public Form1()
{
    InitializeComponent();

    foreach (RadItem item inthis.radRibbonBarBackstageView1.Items)
    {
        BackstageTabItem tabItem = item as BackstageTabItem;
        if (tabItem != null)
        {
            tabItem.Page.VisibleChanged += this.Page_VisibleChanged;
        }
    }
}
private void Page_VisibleChanged(object sender, EventArgs e)
{
    BackstageViewPage page = sender as BackstageViewPage;
    if (page != null && !page.Visible && this.radRibbonBarBackstageView1.SelectedItem == page.Item)
    {
        page.VisibleChanged -= this.Page_VisibleChanged;
        page.Visible = true;
        page.VisibleChanged += this.Page_VisibleChanged;
    }
}