implement click events in wxHeaderCtrl

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57178 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/headerctrl.h

@@ -60,6 +60,7 @@ private:
 
     // override MSW-specific methods needed for new control
     virtual WXDWORD MSWGetStyle(long style, WXDWORD *exstyle) const;
+    virtual bool MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result);
 
     // common part of all ctors
     void Init();
@@ -70,6 +71,10 @@ private:
     enum Operation { Set, Insert };
     void DoSetOrInsertItem(Operation oper, unsigned int idx);
 
+    // send a click or double click event (depending on dblclk value) for the
+    // click with the given button on the given item
+    bool SendClickEvent(bool dblclk, unsigned int idx, int button);
+
 
     // the image list: initially NULL, created on demand
     wxImageList *m_imageList;