How to get RadDatePicker to show Error tooltip when exception is thrown in bound property

[Ollie]

I have the following XAML and I want the error tooltip to show when I throw and exception from the ViewModel property CobDate.

It will show the error tool tip when the CobDate is invalid text, e.g. 'aaaasss' but when it is a valid date but greater then the SelectableDateEnd it will not show the error tool tip when I throw an exception from the ViewModel, it does highlight the textbox of the control with a red border but I want the error tooltip to show as well.

How can I get the error tooltip to show?

<telerik:RadDatePicker DisplayFormat ="Long"
         x:Name="cobDatePicker"
          Width="150"
          SelectableDateStart="{Binding MinDate, Mode=OneWay}"
          SelectableDateEnd="{Binding MaxDate, Mode=OneWay}"
         BlackoutDates="{Binding DisabledDates, Mode=OneWay}"
          ErrorTooltipContent="Invalid Date!"
          AutomationProperties.AutomationId="CobDatePicker">
               <telerik:RadDatePicker.SelectedDate>
                   <Binding Path="CobDate"
                       Mode="TwoWay"
                       ValidatesOnExceptions="False"
                       UpdateSourceTrigger="PropertyChanged">
                       <Binding.ValidationRules>
                           <ExceptionValidationRule />
                       </Binding.ValidationRules>
                   </Binding>
               </telerik:RadDatePicker.SelectedDate>
           </telerik:RadDatePicker>

[Yana]

Hi Ollie,

I am afraid that we do not have Validation ToolTip for RadDatePicker or any other RadControl for WPF - it is available only for Silverlight.
We're following the standard WPF controls behavior which do not provide validation tooltip as well.

We're sorry for any inconvenience caused.

Regards,
Yana
Telerik