Add page highlighting to wxRibbonBar.

Allow visually highlighting a page to make it more noticeable to the user.

Closes #14527.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72347 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/ribbon/ribbondemo.cpp

@@ -401,6 +401,8 @@ MyFrame::MyFrame()
         bar->AddButton(ID_HIDE_PAGES, wxT("Hide Pages"), ribbon_xpm);
         bar->AddButton(ID_SHOW_PAGES, wxT("Show Pages"), ribbon_xpm);
     }
+    new wxRibbonPage(m_ribbon, wxID_ANY, wxT("Highlight Page"), empty_xpm);
+    m_ribbon->AddPageHighlight(m_ribbon->GetPageCount()-1);
 
     m_ribbon->Realize();