More tab code corrections.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4273 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/panelg.h

@@ -78,8 +78,12 @@ public:
         // set the focus to the first child if we get it
     void OnFocus(wxFocusEvent& event);
 
+        // calls layout for layout constraints and sizers
     void OnSize(wxSizeEvent& event);
 
+        // overridden to tab move focus into first focusable child
+    virtual void SetFocus();
+
         // called by wxWindow whenever it gets focus
     void SetLastFocus(wxWindow *win) { m_winLastFocused = win; }
     wxWindow *GetLastFocus() const { return m_winLastFocused; }