-calendar drop down part from which the user can select a date.}
-\twocolitem{\windowstyle{wxDP\_DEFAULT}}{Creates a control with default style
-which is the best supported for the current platform.}
+calendar drop-down part from which the user can select a date.}
+\twocolitem{\windowstyle{wxDP\_DEFAULT}}{Creates a control with the style
+that is best supported for the current platform (currently wxDP\_SPIN
+under Windows and wxDP\_DROPDOWN elsewhere).}
+\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.}