+ // common part of all ctors
+ void Init();
+
+ // call this when items are added to or deleted from the listbox or an
+ // items text changes
+ void MSWOnItemsChanged();
+
+ // flag indicating whether the max horizontal extent should be updated,
+ // i.e. if we need to call SetHorizontalExtent() from OnInternalIdle()
+ bool m_updateHorizontalExtent;
+
+