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    <p>here is a more detailed example:</p> <p>I wrote an example with students and classes. You have a class which has a name and a collection of students. And each student has a name. My classes:</p> <pre><code>public class Class { public string Name { get; set; } public Collection&lt;Student&gt; Students { get; set; } public Class( string name, Collection&lt;Student&gt; students ) { this.Name = name; this.Students = students; } } public class Student { public string Name { get; set; } public string FirstName { get; set; } public string Fullname { get { return string.Format( "{0}, {1}", this.Name, this.FirstName ); } } public Student(string name, string firstname) { this.Name = name; this.FirstName = firstname; } } </code></pre> <p>My from contains tow comboboxes and i want that the first one contains all classes and the second one should contains all students which are in the selected class. I solved this (quick and dirty) in the code behind. I wrote a property for all my classes and mock some data. Here are the important parts:</p> <pre><code>public Collection&lt;Class&gt; Classes { get; set; } public MainWindow() { this.InitializeComponent( ); this.Classes = new Collection&lt;Class&gt;( ) { new Class("Class 1", new Collection&lt;Student&gt;() {new Student("Caba", "Milagros"), new Student("Wiltse","Julio"), new Student("Clinard","Saundra")}), new Class("Class 2", new Collection&lt;Student&gt;() {new Student("Cossette", "Liza"), new Student("Linebaugh","Althea"), new Student("Bickle","Kurt")}), new Class("Class 3", new Collection&lt;Student&gt;() {new Student("Selden", "Allan"), new Student("Kuo","Ericka"), new Student("Cobbley","Tia")}), }; this.DataContext = this; } </code></pre> <p>Now I create my first combobox with the name cmbClass.</p> <pre><code>&lt;ComboBox x:Name="cmbClass" ItemsSource="{Binding Classes}" DisplayMemberPath="Name" Margin="10" Grid.Row="0"/&gt; </code></pre> <p>After that I create my second combobox. But to get the itemsSource, i need the value from the first box. So i use an element binding to get the value from the first box.</p> <pre><code>Binding ElementName=cmbClass </code></pre> <p>And i am interested at the SelectedItem of the first box because this item contains a collection of all needed students(see the class above). So i use the path property to solve this. My second combobox:</p> <pre><code>&lt;ComboBox ItemsSource="{Binding ElementName=cmbClass, Path=SelectedItem.Students}" DisplayMemberPath="Fullname" Margin="10" Grid.Row="1"/&gt; </code></pre> <p>Finish!!!</p> <p>Hope this more detailed solution helps you to understand my way.</p>
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