implemented HitTest() in the native MSW version; added test for it to the sample

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@53006 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/calctrl.h

@@ -44,6 +44,10 @@ public:
 
     virtual void Mark(size_t day, bool mark);
 
+    virtual wxCalendarHitTestResult HitTest(const wxPoint& pos,
+                                            wxDateTime *date = NULL,
+                                            wxDateTime::WeekDay *wd = NULL);
+
 protected:
     virtual wxSize wxCalendarCtrl::DoGetBestSize() const;