Add Quarters (Q1-Q4) to calendar control.

[Enzo]

I would like to add 4 buttons to a calendar that represent the quarters of the year (Q1-Q4).  When the buttons are pressed, they would simply select the appropriate months for that quarter.

I was thinking of creating a control that contained the calendar and a stackpanel with 4 buttons.  They would, when pressed, set the selected date on the calendar control.  This seems ok to me, but then I would have to implement my own datepicker too.

Is there a way to implement this while still using the datepicker control?

Thanks in advance.