Even with wxWS_EX_VALIDATE_RECURSIVELY flag, we should never validate the top
level children (e.g. dialogs) when validating the parent window. This is never
useful and can be completely unexpected.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73482 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775