I have the requirements to style the calendar with a specific Color Theme.

I defined the following Styles:

<UserControl.Resources>

  <ResourceDictionary>

    <Style TargetType="{x:Type igPrim:MonthViewDayHeader}" ... />

    <Style TargetType="{x:Type igPrim:DayViewDayHeader}" ... />

    <Style TargetType="{x:Type igPrim:MonthViewDay}" ... />

    <Style TargetType="{x:Type igPrim:MonthViewWeekHeader}" ... />

  </ResourceDictionary>

</UserControl.Resources>

These Styles are derived from generic.shared.xaml and mainly override the ComputedBackground in the ControlTemplate. 

These Styles are working like intended, except every 5th Monday the default Infragistics Styles are used.

I'll appreciate any help.