+\twocolitem{\windowstyle{wxDP\_ALLOWNONE}}{With this style, the control allows
+the user to not enter any valid date at all. Without it - the default - the control always has some valid date.}
+\twocolitem{\windowstyle{wxDP\_SHOWCENTURY}}{Forces display of the century in
+the default date format. Without this style the century could be displayed, or
+not, depending on the default date representation in the system.}