// Use wxButtonToolBar
-#define wxBK_BUTTONBAR 0x0100
+#define wxTBK_BUTTONBAR 0x0100
+
+// Use wxTB_HORZ_LAYOUT style for the controlling toolbar
+#define wxTBK_HORZ_LAYOUT 0x8000
+
+// deprecated synonym, don't use
+#if WXWIN_COMPATIBILITY_2_8
+ #define wxBK_BUTTONBAR wxTBK_BUTTONBAR
+#endif
// ----------------------------------------------------------------------------
// wxToolbook