allow windows which are placed inside wxStaticBoxes to be built as children of the wxStaticBox itself rather than forcing users to build them as siblings of the static box (closes #9859)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60335 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -284,6 +284,11 @@ Deprecated methods and their replacements
   documented TryBefore/After() methods if you used to override these ones.
 - wxGetMultipleChoices() is deprecated, use wxGetSelectedChoices() which has
   the same signature but returns -1 and not 0 if the dialog was cancelled.
+- building the windows which are placed inside wxStaticBoxes as siblings of the
+  wxStaticBox is still allowed but it's deprecated as it gives some problems
+  on some ports (e.g. wxGTK).
+  You should now create windows placed inside a wxStaticBox as children of
+  the static box itself.
 
 Major new features in this release
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