WPF Menu Sub Items [duplicate] - wpf

Question

Following the example from Omer van Kloeten I filled a menu with menu items bound from my observable collection. I got a single menu item for a single collection item. Fine, but I actually want more. I also want to be able to have a menu item with two or three sub items for one collection item. Here is some rough sketch:
What I Have What I Want
+ First Item + Create First Item
+ Second Item + Second Item
+ Delete
+ Update
Here "First Item" has property Exists = false, but "Second Item" has it true. My current code:
public class CollectionItem
{
public string Name { get; set; }
public bool Exists { get; set; }
}
public partial class MainWindow : Window
{
ObservableCollection<CollectionItem> items;
public MainWindow()
{
items = new ObservableCollection<CollectionItem>();
items.Add(new CollectionItem() { Name = "First Item", Exists = false });
items.Add(new CollectionItem() { Name = "Second Item", Exists = true });
AllItems.ItemsSource = items;
}
}
<MenuItem x:Name="AllItems" Header="What I Have">
<MenuItem.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Header" Value="{Binding Path=Name}" />
</Style>
</MenuItem.ItemContainerStyle>
</MenuItem>
How do I mix simple menu items with sub items?

Answer 1

How do I mix simple menu items with sub items?
First, you need to have your data structured appropriately, with collection properties to represent the child, or sub MenuItems. Then, you need to data bind the collection property to the ItemsSource property of the parent MenuItem using the MenuItem.ItemContainerStyle, similar to what you're doing now. You should end up with something like this:
public class CollectionItem
{
public string Name { get; set; }
public bool Exists { get; set; }
public ObservableCollection<CollectionItem> CollectionOfSubItems { get; set; }
}
...
<MenuItem x:Name="AllItems" Header="What I Have">
<MenuItem.ItemContainerStyle>
<Style TargetType="{x:Type MenuItem}">
<Setter Property="Header" Value="{Binding Path=Name}" />
<Setter Property="ItemsSource" Value="{Binding CollectionOfSubItems}" />
</Style>
</MenuItem.ItemContainerStyle>
</MenuItem>