Data Grid SelectedItems

Hello
I had a similar problem, and I solved this by creating a control that inherits the GridView control (let's call it MyGridView), where I have a new property (with dependency property) that holds the selected items. Then I attach to the SelectionChanged and set the new SelectedItems-property.

Example:

public class MyDataGrid : DataGrid, INotifyPropertyChanged
    {
        public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.Register("SelectedItems", typeof(IList), typeof(MyDataGrid), new PropertyMetadata(null));
        public new IList SelectedItems
        {
            get { return (IList)GetValue(SelectedItemsProperty); }
            set
            {
                SetValue(SelectedItemsProperty, value);
                NotifyPropertyChanged("SelectedItems");
            }
        }

        public MyDataGrid()
            : base()
        {
            base.SelectionChanged += new SelectionChangedEventHandler(MyDataGrid_SelectionChanged);
        }

        private void MyDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            this.SelectedItems = base.SelectedItems;
        }

        public event PropertyChangedEventHandler PropertyChanged;
        private void NotifyPropertyChanged(String aPropertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(aPropertyName));
        }
    }

You can now use your control as an ordinary GridView control, with your alterations.

<grid>
    <local:mydatagrid selectionmode="Extended" xmlns:local="#unknown">
                      ItemsSource="{Binding Path=Items, Mode=OneWay}"
                      SelectedItems="{Binding Path=SelectedItems, Mode=TwoWay}"
                      Margin="0,0,0,20"/>
    <textblock text="{Binding Path=SelectedItems.Count, Mode=OneWay}">
               VerticalAlignment="Bottom" />
</textblock></local:mydatagrid></grid>

You can put more specific code into this control, like navigation behaviors, styling and new functionality.

Hope it helps!