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copied!<p>The code below works fine and is much simpler. However the draw back is the use of the non public property, IsSelectionChangeActive, of the treeview class. Code below:</p> <pre><code>private static readonly PropertyInfo IsSelectionChangeActiveProperty = typeof (TreeView).GetProperty ( "IsSelectionChangeActive", BindingFlags.NonPublic | BindingFlags.Instance ); public static void AllowMultiSelection(TreeView treeView) { if (IsSelectionChangeActiveProperty==null) return; var selectedItems = new List<TreeViewItem>(); treeView.SelectedItemChanged += (a, b) => { var treeViewItem = treeView.SelectedItem as TreeViewItem; if (treeViewItem == null) return; // allow multiple selection // when control key is pressed if (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)) { // suppress selection change notification // select all selected items // then restore selection change notifications var isSelectionChangeActive = IsSelectionChangeActiveProperty.GetValue(treeView, null); IsSelectionChangeActiveProperty.SetValue(treeView, true, null); selectedItems.ForEach(item => item.IsSelected = true); IsSelectionChangeActiveProperty.SetValue ( treeView, isSelectionChangeActive, null ); } else { // deselect all selected items except the current one selectedItems.ForEach(item => item.IsSelected = (item == treeViewItem) ); selectedItems.Clear(); } if (!selectedItems.Contains(treeViewItem)) { selectedItems.Add(treeViewItem); } else { // deselect if already selected treeViewItem.IsSelected = false; selectedItems.Remove(treeViewItem); } }; } </code></pre>

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