Styles and colors in GtkCalendar widget

[Luis Carlos Rosa <luisrosa mail pt>]

Hello to all.
This is a repeated post because the old got HTML
sorry for this. here's is a clean mail


I'm using the GtkCalendar widget and I want to change the color of the marked days, I have checked the API 
and theres no function to do this.
I dont want to change the lib, so I am searching a clean way to do this.
anyone has ever did this? any ideas?
I thought of accessing some internal member of GtkCalendar Struct.


thanks

Luis Rosa