How can get event on selecting the treeViewWithIcon

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WPF

Hi

I started with the TreeViewWithIcon class that gives me the TreeViewItem with Icon
there is need of adding the TreeViewWithIcon dynamically in Backendcode

its ok for me , but i want to show some forms on mouseLeftButton down event that time i have not get the any action from TreeviewWithicon ,

Please help me for getting the event on selecting the TreeViewWithIcon

public class TreeViewWithIcons : TreeViewItem
   {
       #region Global variables
       ImageSource iconSource;
       TextBlock textBlock;
       Image icon;
       #endregion Global variables

       #region Constructors and Destructors
       public TreeViewWithIcons()
       {
           StackPanel stack = new StackPanel();
           stack.Orientation = Orientation.Horizontal;
           Header = stack;
           //Uncomment this code If you want to add an Image after the Node-HeaderText
           //textBlock = new TextBlock();
           //textBlock.VerticalAlignment = VerticalAlignment.Center;
           //stack.Children.Add(textBlock);
           icon = new Image();
           icon.VerticalAlignment = VerticalAlignment.Center;
           icon.Margin = new Thickness(0, 0, 4, 0);
           icon.Source = iconSource;
           stack.Children.Add(icon);
           //Add the HeaderText After Adding the icon
           textBlock = new TextBlock();
           textBlock.VerticalAlignment = VerticalAlignment.Center;
           stack.Children.Add(textBlock);
       }
       #endregion Constructors and Destructors
       #region Properties
       /// <summary>
       /// Gets/Sets the Selected Image for a TreeViewNode
       /// </summary>
       public ImageSource Icon
       {
           set
           {
               iconSource = value;
               icon.Source = iconSource;
           }
           get
           {
               return iconSource;
           }
       }
       #endregion Properties
       #region Event Handlers
       /// <summary>
       /// Event Handler on UnSelected Event
       /// </summary>
       /// <param name="args">Eventargs</param>
       protected override void OnUnselected(RoutedEventArgs args)
       {
           base.OnUnselected(args);
           icon.Source = iconSource;
       }
       /// <summary>
       /// Event Handler on Selected Event
       /// </summary>
       /// <param name="args">Eventargs</param>
       protected override void OnSelected(RoutedEventArgs args)
       {
           base.OnSelected(args);
           icon.Source = iconSource;
       }

       /// <summary>
       /// Gets/Sets the HeaderText of TreeViewWithIcons
       /// </summary>
       public string HeaderText
       {
           set
           {
               textBlock.Text = value;
           }
           get
           {
               return textBlock.Text;
           }
       }
       #endregion Event Handlers
       public BitmapImage CreateImage(string path)
       {
           BitmapImage myBitmapImage = new BitmapImage();
           myBitmapImage.BeginInit();
           myBitmapImage.UriSource = new Uri(path);
           myBitmapImage.EndInit();
           return myBitmapImage;
       }
   }

Thanks and regards
vilas