added RefreshItem(s) methods

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11022 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/listctrl.h

@@ -146,6 +146,13 @@ public:
     // returns true if it is a virtual list control
     bool IsVirtual() const { return (GetWindowStyle() & wxLC_VIRTUAL) != 0; }
 
+    // refresh items selectively (only useful for virtual list controls)
+    void RefreshItem(long item);
+    void RefreshItems(long itemFrom, long itemTo);
+
+    // implementation only from now on
+    // -------------------------------
+
     void OnIdle( wxIdleEvent &event );
     void OnSize( wxSizeEvent &event );