title: Trigger a call to IRibbonExtensibility.GetCustomUI() to force a ribbon UI refresh
body: <p>I am developing an Office add-in. Due to some limitations of ribbon controls (e.g. <code>menuSeparator</code> has no visibility control or <code>splitButton</code> cannot host a <code>dynamicMenu</code> only a <code>menu</code>), I need to be able to cause the Office app to reload the ribbon by repeating a call to my add-in's <code>IRibbonExtensibility.GetCustomUI</code>.</p>
  
  <p>Is this possible?</p>