How to expose xaml properties? <p>I created a ComboBox subclass and added my functionality.</p> <p>Now I want to expose external properties of the TextBox for example:</p> <pre><code>&lt;a:MyComboBox SpellCheck.IsEnabled="True" TextBox.SelectedText="{Binding X}" /&gt; </code></pre> <p>Is this possible, I maybe didn't choose the wrong particular property but I guess you understand what I mean.</p> <p>Is this possible?<br> Do I have to create all the properties individually?</p>