WPF How to style the DateTimePicker

I'm using the DateTimePicker from the WPFTool kit. How Can I style it? Need to change the Month background and font

This what I have so far... thx

  <!-- DatePicker -->
            <Style x:Key="DatePickerStyle"  TargetType="{x:Type my:DatePicker}">
                <Setter Property="Foreground" Value="#FF333333" />
                <Setter Property="IsTodayHighlighted" Value="True" />
                <Setter Property="SelectedDateFormat" Value="Short" />
                <Setter Property="Background" Value="Transparent" />
                <Setter Property="Padding" Value="3,2,0,2"/>
                <Setter Property="BorderBrush">
                    <Setter.Value>
                        <LinearGradientBrush StartPoint="0 0" EndPoint="0 1">
                            <GradientStop Offset="0"   Color="#FFFFC0" />
                            <GradientStop Offset="0.5" Color="#FFE0B0" />
                            <GradientStop Offset="1"   Color="#FFD0A8" />
                        </LinearGradientBrush>
                    </Setter.Value>
                </Setter>
       

            </Style>