Changed CanApplyParentThemeBackground to ApplyParentThemeBackground

and let the windows set the the background colour themselves (or not)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26090 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/bookctrl.h

@@ -161,6 +161,9 @@ public:
         }
     }
 
+    virtual void ApplyParentThemeBackground(const wxColour& bg)
+        { SetBackgroundColour(bg); }
+
 protected:
     // remove the page and return a pointer to it
     virtual wxWindow *DoRemovePage(size_t page) = 0;