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copied!<p>Here is an attached property that hooks to the SelectionChanged event of the ListBox and populates a list of selected items to the ViewModel. You can simply change "ListBox" to "DataGrid".</p> <p><a href="http://marlongrech.wordpress.com/2009/06/02/sync-multi-select-listbox-with-viewmodel/" rel="nofollow noreferrer">http://marlongrech.wordpress.com/2009/06/02/sync-multi-select-listbox-with-viewmodel/</a></p> <p><strong>Edit:</strong> Adding source code for DataGrid version...</p> <pre><code>/// <summary> /// Attached property that stores the selected items of a DataGrid /// </summary> public static class DataGridService { #region SelectedItems /// <summary> /// SelectedItems Attached Dependency Property /// </summary> public static readonly DependencyProperty SelectedItemsProperty = DependencyProperty.RegisterAttached( "SelectedItems", typeof(IList), typeof(DataGridService), new FrameworkPropertyMetadata((IList)null, new PropertyChangedCallback(OnSelectedItemsChanged))); /// <summary> /// Gets the SelectedItems property. /// </summary> /// <param name="d"><see cref="DependencyObject"/> to get the property from</param> /// <returns>The value of the SelectedItems property</returns> public static IList GetSelectedItems(DependencyObject d) { return (IList)d.GetValue(SelectedItemsProperty); } /// <summary> /// Sets the SelectedItems property. /// </summary> /// <param name="d"><see cref="DependencyObject"/> to set the property on</param> /// <param name="value">value of the property</param> public static void SetSelectedItems(DependencyObject d, IList value) { d.SetValue(SelectedItemsProperty, value); } /// <summary> /// Handles changes to the SelectedItems property. /// </summary> /// <param name="d"><see cref="DependencyObject"/> that fired the event</param> /// <param name="e">A <see cref="DependencyPropertyChangedEventArgs"/> that contains the event data.</param> private static void OnSelectedItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var grid = (DataGrid)d; ReSetSelectedItems(grid); grid.SelectionChanged += delegate { ReSetSelectedItems(grid); }; } /// <summary> /// Sets the selected items collection for the specified <see cref="DataGrid"/> /// </summary> /// <param name="grid"><see cref="DataGrid"/> to use for setting the selected items</param> private static void ReSetSelectedItems(DataGrid grid) { IList selectedItems = GetSelectedItems(grid); selectedItems.Clear(); if (grid.SelectedItems != null) { foreach (var item in grid.SelectedItems) { selectedItems.Add(item); } } } #endregion } </code></pre> <p>In the XAML:</p> <pre><code><tk:DataGrid ... local:DataGridService.SelectedItems="{Binding Path=MyCollection}" SelectionMode="Extended"> </code></pre> <p>"MyCollection" should be an ObservableCollection in your ViewModel.</p>

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