Use DeafultAttributes instead of hard coded defaults

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28293 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/vlbox.h

@@ -193,6 +193,14 @@ public:
         { /* do nothing */ }
 
     
+    virtual wxVisualAttributes GetDefaultAttributes() const
+    {
+        return GetClassDefaultAttributes(GetWindowVariant());
+    }
+
+    static wxVisualAttributes
+    GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
+    
 protected:
     // the derived class must implement this function to actually draw the item
     // with the given index on the provided DC