title: Infragistics toolbar, how to show PopupMenu checked state?
body: <p>I have a toolbar managed by UltraToolbarsManager with a StateButton and a PopupMenu tool on it. </p>
  
  <p>Both these controls have a Checked setting.
  When I set Checked = true on both controls the StateButton changes appearance but the PopupMenu does not. As I am using the PopupMenu as a glorified multistate checkbox I would like them to behave similarly</p>
  
  <p>i.e. if any of the StateButtons under the PopupMenu are checked then the PopupMenu should display checked as if it were a StateButton</p>