I am using XamDataGrid in an MVVM application and trying to figure out the recommended way to handle grid filter value/selection change in the ViewModel. So I created an attached property that handles RecordFilterChanged event as shown below. When I modify a filter value on the grid I see that the property RecordFilterChangedCommandChanged never gets executed. Am I handling the wrong event here or something else is wrong?

C#:

public static readonly DependencyProperty RecordFilterChangedCommandProperty = DependencyProperty.RegisterAttached("RecordFilterChangedCommand", typeof(ICommand), typeof(XamDataPresenter), new FrameworkPropertyMetadata((string)null, RecordFilterChangedCommandChanged));

public static void SetRecordFilterChangedCommand(DataPresenterBase grid, ICommand command)

{
 grid.SetValue(RecordFilterChangedCommandProperty, command);
}

public static ICommand GetRecordFilterChangedCommand(DataPresenterBase grid)

{
 return grid.GetValue(RecordFilterChangedCommandProperty) as ICommand;

}

private static void RecordFilterChangedCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)

{
 DataPresenterBase presenter = (DataPresenterBase)d;
 presenter.RecordFilterChanged += (o, ea) =>{

 ICommand command = (ICommand)presenter.GetValue(RecordFilterChangedCommandProperty);
 object commandParameter = presenter.GetValue(RecordFilterChangedCommandParameterProperty);

 if(command.CanExecute(commandParameter))command.Execute(commandParameter);

};

Xaml:

b:XamDataPresenter.RecordFilterChangedCommand="{Binding RecordFilterChanged, RelativeSource={RelativeSource Self}}"

b:XamDataPresenter.RecordFilterChangedCommandParameter="{Binding ActiveDataItem, RelativeSource={RelativeSource Self}}