private void EnsureHostIsOpen()
 {
     if (currentHost == null || !currentHost.IsOpen)
     {
         currentHost = getHost();
         Action openAction = () => currentHost.Open(this);
         Dispatcher.Invoke(openAction);
     }
 }
 private void EnsureHostIsOpen()
 {
     if (currentHost == null || !currentHost.IsOpen)
     {
         currentHost = getHost();
         Action openAction = () => currentHost.Open(this);
         Dispatcher.Invoke(openAction);
     }
 }