Sometimes you just need to walk the tree of Visuals in Avalon.  It's easy to do, but it is even easier if you have a nice Visitor-pattern implementing tree walker.  So:

	using System;
	using System.Collections;
	using System.Diagnostics;
	using System.Windows;
	using System.Windows.Controls;
	using System.Windows.Media;
	using System.Windows.Media.Media3D;

	public delegate void VisualVisitor(Visual v, int depth);

	public class VisualTreeWalker
	{
		private Visual root;
		private int visualCount;

		public event VisualVisitor VisualVisited;

		public VisualTreeWalker(Visual root)
		{
			this.root = root;
		}

		public int Walk()
		{
			this.visualCount = 0;
			this.RecurseVisuals(this.root, 1);
			return this.visualCount;
		}

		private void RecurseVisuals(Visual visual, int currentDepth)
		{
			this.visualCount++;
			this.OnVisualVisit(visual, currentDepth);

			foreach (Visual child in VisualOperations.GetChildren(visual))
			{
				this.RecurseVisuals(child, currentDepth + 1);
			}
		}

		private void OnVisualVisit(Visual v, int currentDepth)
		{
			if (this.VisualVisited != null)
			{
				this.VisualVisited(v, currentDepth);
			}
		}
	}