Index: src/plugins/contrib/help_plugin/help_plugin.cpp
===================================================================
--- src/plugins/contrib/help_plugin/help_plugin.cpp    (revision 4596)
+++ src/plugins/contrib/help_plugin/help_plugin.cpp    (working copy)
@@ -70,6 +70,7 @@
 
 BEGIN_EVENT_TABLE(HelpPlugin, cbPlugin)
     EVT_MENU(idViewMANViewer, HelpPlugin::OnViewMANViewer)
+    EVT_UPDATE_UI(idViewMANViewer, HelpPlugin::OnUpdateUI)
 END_EVENT_TABLE()
 
 #ifdef __WXMSW__
@@ -456,6 +457,15 @@
     Manager::Get()->GetConfigManager(_T("help_plugin"))->Write(_T("/show_man_viewer"), show);
 }
 
+void HelpPlugin::OnUpdateUI(wxUpdateUIEvent& event)
+{
+    wxMenuBar* pbar = Manager::Get()->GetAppFrame()->GetMenuBar();
+
+    // uncheck checkbox if window was closed
+    if(m_manFrame && !m_manFrame->IsShown())
+        pbar->Check(idViewMANViewer, false);
+}
+
 void HelpPlugin::LaunchHelp(const wxString &c_helpfile, bool isExecutable, const wxString &keyword)
 {
   const static wxString http_prefix(_T("http://"));
Index: src/plugins/contrib/help_plugin/help_plugin.h
===================================================================
--- src/plugins/contrib/help_plugin/help_plugin.h    (revision 4596)
+++ src/plugins/contrib/help_plugin/help_plugin.h    (working copy)
@@ -26,6 +26,7 @@
     void OnAttach(); // fires when the plugin is attached to the application
     void OnRelease(bool appShutDown); // fires when the plugin is released from the application
     void Reload(); // called after the settings have been applied
+    void OnUpdateUI(wxUpdateUIEvent& event); // called when showing View menu
 
   protected:
     void OnViewMANViewer(wxCommandEvent &event);