I've been fighting with this most of the time.  I get a selection of rows from the grid and then I move to the next page ( this is a wpf app ).  My selection then populates another grid.  All that works wonderfully.  The problem is when going back.  I want my first grid to reflect the rows that I selected.  The collection fred has the correct entries.  How do I feed this back to the first grid so that it knows it has these particular rows selected?  Any guidance would be much appreciated.

public class DataGridExtender : Behavior<XamGrid>

    {

        private Row _firstSelection;

        public readonly static DependencyProperty SelectedDataItemsProperty

            = DependencyProperty.Register(

                "SelectedDataItems"

                , typeof(ICollection<object>)

                , typeof(DataGridExtender)

                , new PropertyMetadata(null));

        public ICollection<object> SelectedDataItems

        {

            get {

                return (ICollection<object>)GetValue(SelectedDataItemsProperty);

            }

            set { SetValue(SelectedDataItemsProperty, value); }

        }

public ResultFileSelectionView()  //this is a user control

        {

            InitializeComponent();

            selectedFiles = new List<CalibrationFile>();

            this.resultsList.ItemsSource = ViewModels.ResultFileSelectionViewModel.GetData();

            selectedFiles = ViewModels.ResultFileSelectionViewModel.GetFilesSelected();

            List<object> fred = new List<object>();

            foreach (CalibrationFile f in selectedFiles)

                fred.Add(f);

// I'm sure this isn't right, but I'm not sure how to get this property to percolate to the grid.

// this.resultsList is the XamDataGrid

            OnPropertyChanged(new DependencyPropertyChangedEventArgs(ViewModels.DataGridExtender.SelectedDataItemsProperty, this.resultsList, fred));

        }