added wxWindow::NavigateIn(); provide wxGTK implementation of DoNavigateIn() working with native tab traversal

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45084 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/window.h

@@ -344,6 +344,8 @@ protected:
     void Init();
 
     virtual void DoMoveInTabOrder(wxWindow *win, MoveKind move);
+    virtual bool DoNavigateIn(int flags);
+
 
     // Copies m_children tab order to GTK focus chain:
     void RealizeTabOrder();