DateNavigator: SpecialDates with multiple colors

Hi Enis,
This behavior is expected. To update the multi-binding, you need to add at least one condition to the dynamic property. For example, modify your binding and converters in the following manner:

XAML
<DataTrigger Value="True" >  
    <DataTrigger.Binding>  
        <MultiBinding Converter="{local:CellConverter}">  
            <Binding Path="(dxe:DateNavigator.Navigator).SpecialDates" RelativeSource="{RelativeSource Self}"/>  
            <Binding Path="(dxednc:DateNavigatorCalendar.DateTime)" RelativeSource="{RelativeSource Self}"/>  
        </MultiBinding>  
    </DataTrigger.Binding>  
    <Setter TargetName="ContentSpecial" Property="ForegroundSolidColor1" >  
        <Setter.Value>  
            <MultiBinding Converter="{StaticResource WorktimeColorConverter}" ConverterParameter="Foreground">  
                <Binding RelativeSource="{RelativeSource TemplatedParent}" />  
                <Binding Path="." />  
                <Binding Path="(dxednc:DateNavigatorCalendar.DateTime)" RelativeSource="{RelativeSource Self}" />  
            </MultiBinding>  
        </Setter.Value>  
    </Setter>  


    <Setter TargetName="BorderSpecial" Property="Background" >  
        <Setter.Value>  
            <MultiBinding Converter="{StaticResource WorktimeColorConverter}" ConverterParameter="Background">  
                <Binding RelativeSource="{RelativeSource TemplatedParent}" />  
                <Binding  Path="." />  
                <Binding  Path="(dxednc:DateNavigatorCalendar.DateTime)" RelativeSource="{RelativeSource Self}" />  
            </MultiBinding>  
        </Setter.Value>  
    </Setter>  
</DataTrigger>  

C#
public class CellConverter : MarkupExtension, IMultiValueConverter {  
    public CellConverter() { }  
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) {  
        var dt = (DateTime)values[1];  
        IList<DateTime> spD = (IList<DateTime>)values[0];  

        return spD != null && spD.Contains(dt);  
    }  

C#
public class WorktimeColorConverter : IMultiValueConverter {  
    public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)  {  
        try {  
            if (values.Count() >= 2) {