HI,

 Here are some code snippets:

 <Grid.Resources>    

         <Style TargetType="{x:Type my:XamMonthCalendar}">   

              <Setter Property="Background" Value="Yellow"/>        

           </Style>     

        <Style TargetType="{x:Type my:CalendarDay}">   

              <Setter Property="Background" Value="Aqua"/>      

               <Setter Property="Foreground" Value="Red"/>     

        </Style>    

     </Grid.Resources>     

    <my:XamDateTimeEditor HorizontalAlignment="Left" Margin="134,48,0,0" Name="xamDateTimeEditor1" VerticalAlignment="Top" Width="190" />

Sincerely,
 Matt
Developer Support Engineer