1. wxDir works for MSW and documented

2. wxDateTime works with dates very close to the Epoch
3. setting font for wxRadioBox works


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4899 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/tfile.tex

@@ -1,6 +1,6 @@
 \section{File classes and functions overview}\label{wxfileoverview}
 
-Classes: \helpref{wxFile}{wxfile}, \helpref{wxTempFile}{wxtempfile}, 
+Classes: \helpref{wxFile}{wxfile}, \helpref{wxDir}{wxdir}, \helpref{wxTempFile}{wxtempfile}, 
 \helpref{wxTextFile}{wxtextfile}
 
 Functions: see \helpref{file functions}{filefunctions}.
@@ -25,3 +25,6 @@ and program source files. It can be also used to work with files with "non
 native" line termination characters and write them as "native" files if needed
 (in fact, the files may be written in any format).
 
+wxDir is a helper class for enumerating the files or subdirectories of a
+directory. It may be used to enumerate all files, only files satisfying the
+given template mask or only non-hidden files.