GridViewComboBoxColumn not showing validation hints

[Kelly]

I'm seeing some weird behavior with a GridViewComboBoxColumn when validation fails.  When I put a null value in the column, I get hints (red ! icon, red box around row) but nothing in the cell itself as I do in other grids.  The property bound to the column has a [Required] attribute on it.  Am I doing something wrong?

Thanks!

<telerik:RadGridView x:Name="StatusGrid"        ...                                      ItemsSource="{Binding Path=Retailer.Statuses}"        prismCommands:RowEditEndedCommand.Command="{Binding ValidateStatus}"        SelectionMode="Extended"        ShowGroupPanel="False"        ValidatesOnDataErrors="InViewMode">        <telerik:RadGridView.Columns> <telerik:GridViewComboBoxColumn Width="375"                        DataMemberBinding="{Binding SelectedType,                                            Mode=TwoWay}"                        DisplayMemberPath="Description"                        Header="Status"                        HeaderCellStyle="{StaticResource RequiredGridViewHeaderCellStyle}"                        IsReadOnlyBinding="{Binding IsExisting}"                        ItemsSourceBinding="{Binding Source={StaticResource ViewDataContext},                                                     Path=DataSource.StatusTypes}" />                <telerik:GridViewDataColumn Width="100"                        DataFormatString="{}{0:MM/dd/yyyy}"                        DataMemberBinding="{Binding EffectiveDate,                                                    Mode=TwoWay}"                        Header="Effective Date"                        HeaderCellStyle="{StaticResource RequiredGridViewHeaderCellStyle}"                                                         IsReadOnlyBinding="{Binding IsExisting}" />                         </telerik:RadGridView.Columns>                     </telerik:RadGridView>

[Kelly]

Got it figured out.  There was a property being used that was declared in a partial class related to one of the automatically generated entities that RIA Services creates.  

[Kelly]

Now something even stranger is happening.  I'm getting the validation error message twice.  See attached image.

The property being bound to is below.  The xaml is the same as I posted above.

        [Required(ErrorMessage = "Status is required.")]
        public RetailerStatusType SelectedType
        {
            get { return this.selectedType; }
            set
            {
 
                if ((this.selectedType != value))
                {
                    this.selectedType = value;
 
                    if (this.selectedType == null)
                    {
                        StatusTypeId = 0;
                        StatusCode = string.Empty;
                    }
                    else
                    {
                        StatusTypeId = this.selectedType.Id;
                        StatusCode = this.selectedType.Code;
                    }
                }
            }
        }

[Yoan]

Hello Kelly,

Can you give us more details how the validation is performed in your application? Are you using only DataAnnotations? It will be great if you can send us a sample project which reproduces the problem? We will debug it on our side and will check what is going on.

All the best,
Yoan
the Telerik team