Select NONE

?

Actually that bug still exists.

Here's how I tried to get rid of it. CCalendarView is whatever you've called the CView for your calendar. My addition in blue. It DOES NOT work as expected. So the question to CJ is, how does one turn off the selection box? Especially for printing! It's not a question of an event existing or not, it's how to turn off the highlighting on a non-event when necessary.

void CCalendarView::OnFilePrintPreview()
{
    GetDocument()->m_bPreview = TRUE;

    CXTPCalendarView* pView = DYNAMIC_DOWNCAST(CXTPCalendarDayView, GetCalendarCtrl().GetActiveView());
    if (pView)
    {
        pView->ResetSelection();
        pView->RedrawControl();
    }

    CPrintPreviewState* pState = new CPrintPreviewState;

    if ( !DoPrintPreview( XTP_IDD_PREVIEW_DIALOGBAR, this,
        RUNTIME_CLASS( CXTPPreviewView ), pState ))
    {
        TRACE0( "Error: DoPrintPreview failed.\n" );
        AfxMessageBox( AFX_IDP_COMMAND_FAILURE );
        delete pState;      // preview failed to initialize, delete State now
    }
}

As you can see, ResetSelection removes any selection.