SmashBrando

// This event uses the bubbling routing strategy
              public static readonly RoutedEvent CheckedEvent = EventManager.RegisterRoutedEvent(
                     "Checked", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(TreeView));
  
              public static void AddCheckedHandler(DependencyObject d, RoutedEventHandler handler)
              {
                     UIElement uie = d as UIElement;
                     if (uie != null)
                     {
                           uie.AddHandler(CheckedTreeViewItem.CheckedEvent, handler);

SmashBrando

// Get the control's Type
  Type controlViewType = ((UIElement)control).GetType();
  
  // Dig out the undocumented (yes, I know, it's risky) EventHandlerStore
  // from the control's Type
  PropertyInfo EventHandlersStoreType =
  controlViewType.GetProperty("EventHandlersStore",
  BindingFlags.Instance | BindingFlags.NonPublic);
  
  // Get the actual "value" of the store, not just the reflected PropertyInfo

SmashBrando

public class BindToClickEventCommand : ICommand
    {
              private Action _handler;
  
              public ViewModelCommand(Control control)
              {
                     
                     // Get the control's Type
                     Type someTreeViewType = ((UIElement)control).GetType();
  

SmashBrando

public BindToClickEventCommand CheckedEvent
{
 get
 {
  return new BindToClickEventCommand(TreeView);
 }
}

SmashBrando

<HierarchicalDataTemplate x:Key="CheckBoxTreeViewItemTemplate" ItemsSource="{Binding Items, Mode=OneWay}" >
        <StackPanel Orientation="Horizontal">
            <Image Margin="2,0" Source="{Binding ImageSource, Mode=TwoWay}" />
                     <CheckBox Focusable="False" IsChecked="{Binding IsChecked}" VerticalAlignment="Center"
                                    <span style="background-color: #ffff00;">Command="{Binding CheckedEvent}"</span>/>
                     <ContentPresenter Content="{Binding Text, Mode=TwoWay}" Margin="2,0" />
        </StackPanel>
    </HierarchicalDataTemplate>

SmashBrando

<TreeView ...    local:CheckBoxTreeViewItem.Checked="item_Checked"