+#if wxUSE_SCROLLBAR
+ // clear pointers to scrollbar before deleting the children: they are
+ // children and so will be deleted by DestroyChildren() call below and if
+ // any code using the scrollbars would be called in the process or from
+ // ~wxWindowBase, the app would crash:
+ m_scrollbarVert = m_scrollbarHorz = NULL;
+#endif
+