However, when I call CXTPWinApp::ExitInstance(), and as the app starts to close, when XTPShutdown() is called during ~XTPApplication(), I get an assertion error during:
template<class Owner, class Observer>
AFX_INLINE CXTPObservable<Owner, Observer>::~CXTPObservable()
{
    ASSERT("All observers must be unsubscribed before destruction" && 0 == m_Observers.GetSize());
}

I can use CXTPPaintManager::SetTheme(xtpThemeOffice2000) before calling CXTPWinApp::ExitInstance(), this error doesn't occur. I wanted to ask if there is a more elegant solution, or if this workaround is the only solution at the moment.