Grouping items in a ComboBox

Question

I have a ListView that contains two types of objects, single and multiple. The single is a ordinary TextBlock while the multiple is a ComboBox with items.

I'm trying to group the items in the ComboBox without success. Is it possible? Or should I go for a different approach?

What I'm trying to achieve:

[ComboBox v]     [Header  ]     [    Item]     [    Item]     [Header  ]     [    Item] 

Answer 1

It is possible. Use a ListCollectionView with a GroupDescription as the ItemsSource and just provide a GroupStyle to your ComboBox. See sample below:

XAML:

<Window x:Class="StackOverflow.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:local="clr-namespace:StackOverflow"         xmlns:uc="clr-namespace:StackOverflow.UserControls"         Title="MainWindow" Height="350" Width="525">     <StackPanel>         <ComboBox x:Name="comboBox">             <ComboBox.GroupStyle>                 <GroupStyle>                     <GroupStyle.HeaderTemplate>                         <DataTemplate>                             <TextBlock Text="{Binding Name}"/>                         </DataTemplate>                     </GroupStyle.HeaderTemplate>                 </GroupStyle>             </ComboBox.GroupStyle>             <ComboBox.ItemTemplate>                 <DataTemplate>                     <TextBlock Text="{Binding Name}"/>                 </DataTemplate>             </ComboBox.ItemTemplate>         </ComboBox>     </StackPanel> </Window> 

Code-behind:

namespace StackOverflow {     /// <summary>     /// Interaction logic for MainWindow.xaml     /// </summary>     public partial class MainWindow : Window     {          public MainWindow()         {             InitializeComponent();             //this.comboBox.DataContext = this;              List<Item> items = new List<Item>();             items.Add(new Item() { Name = "Item1", Category = "A" });             items.Add(new Item() { Name = "Item2", Category = "A" });             items.Add(new Item() { Name = "Item3", Category = "A" });             items.Add(new Item() { Name = "Item4", Category = "B" });             items.Add(new Item() { Name = "Item5", Category = "B" });              ListCollectionView lcv = new ListCollectionView(items);             lcv.GroupDescriptions.Add(new PropertyGroupDescription("Category"));              this.comboBox.ItemsSource = lcv;         }       }      public class Item     {         public string Name { get; set; }         public string Category { get; set; }     }  }