-attributes of each item managed by a \helpref{wxSizer}{wxsizer}. In
-normal usage user code should never need to deal directly with a
-wxSizerItem, but derived sizer classes will.
+attributes of each item managed by a \helpref{wxSizer}{wxsizer}. It is not
+usually necessary to use this class because the sizer elements can also be
+identified by their positions or window or sizer pointers but sometimes it may
+be more convenient to use it directly.