 <p>Your <code>ItemsSource</code> is a simple binding to a collection of [something] that will fill out the combolist, here's a quick sample:</p> <pre><code>public class MyDataSource { public IEnumerable&lt;string&gt; ComboItems { get { return new string[] { "Test 1", "Test 2" }; } } } &lt;ComboBox Height="23" Name="status" IsReadOnly="False" ItemsSource="{Binding Path=ComboItems}" Width="120"&gt; &lt;/ComboBox&gt; </code></pre> <p>That's not a complete sample, but it gives you the idea.</p> <p>It's also worth noting that you <strong>don't have to use</strong> the <code>ItemsSource</code> property, this is also acceptable:</p> <pre><code>&lt;ComboBox Height="23" Name="status" IsReadOnly="False" Width="120"&gt; &lt;ComboBox.Items&gt; &lt;ComboBoxItem&gt;Test 1&lt;/ComboBoxItem&gt; &lt;ComboBoxItem&gt;Test 2&lt;/ComboBoxItem&gt; &lt;/ComboBox.Items&gt; &lt;/ComboBox&gt; </code></pre>