[Solved] AutoCompleteBox entity "Required Field" validation message

[Rob]

How do I display an inline validation message on a RadAutoCompleteBox in Silverlight e.g. "Required Field"?

I have the following XAML code bound to an entity with a "Required" attribute on it:

<telerik:RadAutoCompleteBox Grid.Column="0"
                                        Grid.Row="2"
                                        Margin="0,0,2,0"
                                        ItemsSource="{Binding LiquidOutputUnits}"
                                        DisplayMemberPath="OutputUnit"
                                        SelectionMode="Single"
                                        TextSearchMode="Contains"
                                        FilteringBehavior="{StaticResource RadAutoCompleteBoxEmptySearchShowAllFilter}"
                                        SearchText="{Binding ChemCodeFormModel.LiquidSearchText, FallbackValue='', TargetNullValue='', Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True, ValidatesOnNotifyDataErrors=True}"
                                        SelectedItem="{Binding ChemCodeFormModel.LiquidSelectedItem, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnDataErrors=True, ValidatesOnExceptions=True, ValidatesOnNotifyDataErrors=True}"
                                        />

If I bind the "SearchText" binding to the Text property of a TextBox the validation message displays as expected and I have plenty of other input controls on the form that are bound in the same way including to a RadComboBox and they are also working as expected.

Edit: I've justed added a BindingValidationEvent to the code-behind and the Validation Exception is definitely being caught, it's just not being displayed - I just want the typical red highlighting with the red popup-box...

[Vladi]

Hi,

In our latest released versions of RadAutoCmpleteBox there is a built-in validation Style and all you need to is to implemented a data validation in your ViewModel.

I created and attached a sample project for you that shows how to achieve a validation in the control in which there is a validation Tooltip message, hope this is helpful.

Regards,
Vladi
Telerik