Separated out book control sizing code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37213 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/bookctrl.h

@@ -207,6 +207,9 @@ protected:
     // Always rely on GetBestSize, which will look at all the pages
     virtual void SetInitialBestSize(const wxSize& WXUNUSED(size)) { }
 
+    // Lay out controls
+    void DoSize();
+
     // the array of all pages of this control
     wxArrayPages m_pages;