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You can create a new item in the <code>DataSource</code> of the <code>ComboBox</code> which name is "ADD NEW ITEM" and handle when the user select it. <pre><code>private void SelectItem(object sender, SelectionChangedEventArgs e) { if (e.AddedItems[0].ToString() == "new") { string newItem = "completely new item"; dataSource.Add(newItem); ((ComboBox)sender).SelectedItem = newItem; } } </code></pre> In this question you can see a better example that each item is an instance of a class, so it's easier to handle the "add item" request: <a href="https://stackoverflow.com/questions/4022118/databound-wpf-combobox-with-new-item">Databound WPF ComboBox with 'New...' item</a> <hr> Edit (about the 'add item' button template): Based on the example above Having this class <pre><code>public class DisplayClass { public string Name { get; set; } public bool IsDummy { get; set; } } </code></pre> You bind <code>ComboBox.ItemsSource</code> to an <code>ObservableCollection</code> like this one: <pre><code>public ObservableCollection<DisplayClass> DataSource { get; set; } </code></pre> Add that "dummy" item to the collection <pre><code>DataSource.Add(new DisplayClass { Name = "ADD ITEM", IsDummy = true }); </code></pre> Then you handle the item selection with something like this: <pre><code>private void SelectItem(object sender, SelectionChangedEventArgs e) { var comboBox = (ComboBox)sender; var selectedItem = comboBox.SelectedItem as DisplayClass; if (selectedItem != null && selectedItem.IsDummy) { //Creating the new item var newItem = new DisplayClass { Name = comboBox.Items.Count.ToString(), IsDummy = false }; //Adding to the datasource DataSource.Add(newItem); //Removing and adding the dummy item from the collection, thus it is always the last on the 'list' DataSource.Remove(selectedItem); DataSource.Add(selectedItem); //Select the new item comboBox.SelectedItem = newItem; } } </code></pre> To display the items properly, you'll need to change the <code>ComboBox.ItemTemplate</code>, making the image invisible when the item is dummy <pre><code><ComboBox ItemsSource="{Binding DataSource}" SelectionChanged="SelectItem"> <ComboBox.ItemTemplate> <DataTemplate> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Name}" Width="180" /> <Image HorizontalAlignment="Right" Source="..." MouseLeftButtonUp="DeleteItem"> <Image.Style> <Style TargetType="Image"> <Style.Triggers> <DataTrigger Binding="{Binding IsDummy}" Value="True"> <Setter Property="Visibility" Value="Hidden" /> </DataTrigger> </Style.Triggers> </Style> </Image.Style> </Image> </StackPanel> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> </code></pre>
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