Accessing ListView within an ItemTemplate - wpf

Question

I have an ItemsControl that is bound to a list of Objects.
I have an ItemTemplate set for the ItemsControl... and within the ItemTemplate I have a ListView, which I want to bind to another list of Objects.
How do I gain access to the ListView within the ItemsControl.ItemTemplate so that I can set it's DataContext to the second list of objects?
Here is an example of what I have:
<ItemsControl x:Name="DealerShips" ItemsSource="{Binding}">
<ItemsControl.ItemTemplate>
<DataTemplate>
<Expander Header="{Binding Name}" Foreground="White">
<ListView x:Name="CarTypes" ItemsSource="{Binding}">
<ListView.ItemTemplate>
<CheckBox Content="{Binding Path=Name}" IsChecked="{Binding Path=InStock}"></CheckBox>
</ListView.ItemTemplate>
</ListView>
</Expander>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
In my VB.NET code I can refer to my "DealerShips" ItemsControl to set the DataContext to a List(Of DealerShip) Objects. I can't figure out how to gain access to the "CarTypes" ListView so that I can set it's DataContext.
Public Class CarsWindow
Private _listOfDealerShips As ObservableCollection(Of DealerShip)
Private _listOfInventory As ObservableCollection(Of Car)
Private Sub Window_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
_listOfDealerShips = New ObservableCollection(Of DealerShip)
listOfDealerShips.Add(New DealerShip("A"))
listOfDealerShips.Add(New DealerShip("B"))
listOfDealerShips.Add(New DealerShip("C"))
_listOfInventory = New ObservableCollection(Of Cars)
listOfDealerShips.Add(New Car("TypeX",True))
listOfDealerShips.Add(New Car("TypeY",False))
listOfDealerShips.Add(New Car("TypeZ",True))
DealerShips.DataContext = _listOfDealerShips
' I cannot access CarTypes....
'CarTypes.DataContext = listOfInventory
End Sub
Private Class DealerShip
Public Property Name As String
Public Sub New
End Sub
Public Sub New(ByVal name As String)
Me.Name = name
End Sub
End Class
Private Class Car
Public Property Name As String
Public Property InStock As Boolean
Public Sub New
End Sub
Public Sub New(ByVal name As String, ByVal isInStock As Boolean)
Me.Name = name
Me.InStock = isInStock
End Sub
End Class
End Class
Thank you for your help!
-Frinny

Answer 1

Can you setup a viewmodel that contains your lists and make them public, set the cars window's DataContext to an instance of the viewmodel (maybe via DI), then change your listview in xaml to look like this:
<ListView x:Name="CarTypes" ItemsSource="{Binding DataContext.ListOfInventory, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}}">

Answer 2

I ended up creating a class that had both lists within it.
Like this:
Public Class DealershipDetails
Public Property ListOfDealerShips As ObservableCollection(Of DealerShip)
Public Property ListOfInventory As ObservableCollection(Of Car)
Public Sub New()
ListOfDealerShips = New ObservableCollection(Of DealerShip)
ListOfDealerShips.Add(New DealerShip("A"))
ListOfDealerShips.Add(New DealerShip("B"))
ListOfDealerShips.Add(New DealerShip("C"))
ListOfInventory = New ObservableCollection(Of Cars)
ListOfInventory.Add(New Car("TypeX",True))
ListOfInventory.Add(New Car("TypeY",False))
ListOfInventory.Add(New Car("TypeZ",True))
End Sub
End Class
That way I could bind the ItemsControl to an instance of the DealershipDetails class and selectively bind the controls within the ItemsControl to the appropriate lists.
While this approach works, my original question remains unanswered.
I do not know how to access a child control.
-Frinny