ItemsSource is not updated on insert?

[Rune]

I Have a GridView bound to a ItemsSource and I'm using mvvm. The problem is when I click "Insert" and/or "Click here to add new item" nothing happens. I can edit the data in the rows and delete row and then grid updates. But not insert new rows.

WPF Code:

<telerik:RadGridView ItemsSource="{Binding WellCompletionEvaluation.CompletionItems}" AutoGenerateColumns="False" CanUserInsertRows="True" Grid.Row="24" Grid.Column="0" Grid.ColumnSpan="6"
               MinHeight="200" MaxHeight="500" ShowInsertRow="True" ShowGroupPanel="False"
               CanUserFreezeColumns="False" RowIndicatorVisibility="Collapsed">

In my model I have this kind of code:

public class WellCompletionEvaluationViewModel : ValidatedViewModelBase
    {
        private readonly JobInfoOperationWellCompletionEvaluation model;

        public ObservableCollection<WellCompletionEvaluationCompletionItemsViewModel> CompletionItems { get; private set; }


        public WellCompletionEvaluationViewModel(JobInfoOperationWellCompletionEvaluation model)
        {
            this.model = model;

            WTConfiguration = new WellCompletionEvaluationWTConfigurationViewModel(model.WTConfiguration);

            this.CompletionItems = new ObservableCollection<WellCompletionEvaluationCompletionItemsViewModel>(
                from p in this.model.completionItems
                select new WellCompletionEvaluationCompletionItemsViewModel(p));


        }

        public JobInfoOperationWellCompletionEvaluation Model { get { return this.model; } }


        public WellCompletionEvaluationWTConfigurationViewModel WTConfiguration
        {
            get;
            set;
        }
}

ValidatedViewModelBase implements IDataErrorInfo and ViewModelBase that implements INotifyPropertyChanged and IDisposable

Is there something wrong with my view model+

Best Regards
Rune

[Maya]

Hello Rune,

Could you verify whether you have a default (parameterless) constructor for your business object ?  

Greetings,
Maya
the Telerik team

[Rune]

Awesome that helps :)

Thank you very much!