When I update the MRU list in the application menu and then open the application menu again I have to wait around 10 seconds till the menu finally opens.

So I'm updating the list like this

            this.Ribbon.ApplicationMenu.RecentItems.Clear();
            for (int i = 0; i < m_MRU.Count; i++)
            {
                ButtonTool bt = new ButtonTool();
                bt.Click += new RoutedEventHandler(AppMenuMRU_Click);
                bt.Caption = m_MRU.ElementAt(i);
                this.Ribbon.ApplicationMenu.RecentItems.Add(bt);
            }

then wait a bit, then click on the orb and then just sit and wait. After 10 secs the menu finally opens.

Bug in XamRibbon?

Edit: using Infra 11.1