RadDatePicker tooltip on validation error from viewmodel

[Andy]

Hi,

I'm trying to set the tooltip on the RadDatePicker when I get a validation error from my viewmodel.

<Trigger Property="Validation.HasError"Value="True">
<Setter Property="FrameworkElement.ToolTip"
                                 Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors).CurrentItem, Converter={StaticResource edenValidationErrorToolTipConverter}}"
                                    TargetName="PART_DateTimeInput" />
                        </Trigger>

No matter  what I try, I can't seem to update the tooltip.

Thanks,
Andy

[Kaloyan]

Hi Andy,

In case your RadDatePickers are data bound, you have to defined the binding expression to throw an exception in case of invalid input date:

<telerik:RadDatePicker>
            <telerik:RadDatePicker.SelectedDate>
                <Binding Path="SelectedDate" ValidatesOnDataErrors="True"
                        UpdateSourceTrigger="PropertyChanged">
                    <Binding.ValidationRules>
                        <ExceptionValidationRule />
                  <DataErrorValidationRule />
                    </Binding.ValidationRules>
                </Binding>
            </telerik:RadDatePicker.SelectedDate>
        </telerik:RadDatePicker>

All the best,
Kaloyan
the Telerik team