I'm in PB 12.6, Windows 8, looking at the MonthCalendar control.  Setting properties such as MonthBackColor, TextColor, TitleBackColor, etc. have no effect.  I found this from Dave Fish, Sybase, 2009:

The Vista operating system does not support several properties for the
DatePicker, EditMask, and MonthCalendar controls and the drop-down
calendar in a DataWindow column.

...

Unfortunately these are wrapped Microsoft controls
and Microsoft has not corrected these problems on Vista yet.

Is this still a problem?  It's hard to believe.

Thanks,

Mark Hulser