You should not use AddWindow, AddSizer, AddSpacer (and similar for
Insert, Prepend, and etc.) methods any longer. Just use Add and the
wrappers will figure out what to do. **[Changed in 2.5.2.x]**
-AddWindow, AddSize, AddSpacer and etc. will now issue a
+AddWindow, AddSizer, AddSpacer and etc. will now issue a
DeprecationWarning.
**[Changed in 2.5.2.x]** The Sizers have had some fundamental internal