added missing refresh when changing focus in wxListCtrl, added test for it in the sample

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11368 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/listctrl/listtest.h

@@ -84,6 +84,7 @@ public:
     void OnSmallIconTextView(wxCommandEvent& event);
     void OnVirtualView(wxCommandEvent& event);
 
+    void OnFocusLast(wxCommandEvent& event);
     void OnToggleFirstSel(wxCommandEvent& event);
     void OnDeselectAll(wxCommandEvent& event);
     void OnSelectAll(wxCommandEvent& event);
@@ -144,6 +145,7 @@ enum
     LIST_TOGGLE_FIRST,
     LIST_SHOW_COL_INFO,
     LIST_SHOW_SEL_INFO,
+    LIST_FOCUS_LAST,
 
     LIST_CTRL                   = 1000
 };