One nice use of VisualTreeHelper class
VisualTreeHelper class provides utility members that provide common tasks regarding nodes in the visual tree like finding childs, parents,sbilings etc. This class cannot be created directly in xaml.
Following example code shows you how to find the first child object of a certain type for eg: Find the ScrollViewer visual [...]

Create Windows sidebar using Windows Presentation Foundation and Visual Studio 2008.

Requirements

a. Windows Vista or Windows 7
b. .net framework 3.5
c. Visal studio 2008

Steps

a. Start up the visual studio and create new wpf application.
b. From the solution exlporer panel open up the windows1.xaml file (default mail window created by vs while creating new project).
c. Remove the [...]

In wpf can traverse through VisualTree using VisualTreeHelper class to find the controls. Here is the example to find all the checkboxes inside a control using VisualTreeHelper class.
C# code (wpf)
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for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parentcontrol); i++)

{

[...]

WPF exists as a subset of .NET Framework types that are for the most part located in the System.Windows namespace. If you have previously built applications with .NET Framework using managed technologies like ASP.NET and Windows Forms, the fundamental WPF programming experience should be familiar.
XAML:
XAML is a markup language ued to construct layout in Windows [...]