\twocolitem{{\windowstyle wxFD\_FILE\_MUST\_EXIST}}{For open dialog only: the user may only select files that actually exist.}
\twocolitem{{\windowstyle wxFD\_MULTIPLE}}{For open dialog only: allows selecting multiple files.}
\twocolitem{{\windowstyle wxFD\_CHANGE\_DIR}}{Change the current working directory to the directory where the file(s) chosen by the user are.}
+\twocolitem{{\windowstyle wxFD\_PREVIEW}}{Show the preview of the selected files (currently only supported by wxGTK using GTK+ 2.4 or later).}
\end{twocollist}
{\bf NB:} Previous versions of wxWidgets used {\tt wxFD\_CHANGE\_DIR} by default