#if wxUSE_NOTEBOOK
 
-#include "wx/imaglist.h"
 #include "wx/notebook.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/dcmemory.h"
+#endif
+
+#include "wx/imaglist.h"
 #include "wx/spinbutt.h"
-#include "wx/dcmemory.h"
 
 #include "wx/univ/renderer.h"
 
                         long style,
                         const wxString& name)
 {
+    if ( (style & wxBK_ALIGN_MASK) == wxBK_DEFAULT )
+        style |= wxBK_TOP;
+
     if ( !wxControl::Create(parent, id, pos, size, style,
                             wxDefaultValidator, name) )
         return false;