WPF Databinding ListView To A Property Of An Object Which Can Be Nothing?

I'm trying to create a Window with a ListView and an Area where details to the selected Object are displayed. The Listview displays items stored in an ObservableCollection(Of T) Collection. The items itself contain also an ObservableCollecton(Of T) Collection which should then be displayed in the details area in another ListView, accordingly to the selected item of the first ListView.

The Problem: The InitializeComponent() throws an Exception (XAMLParseException).

Exception:Set property 'System.Windows.Controls.GridViewColumn.DisplayMemberBinding' threw an exception.

InnerException:Object of type 'System.String' cannot be converted to type 'System.Windows.Data.BindingBase'.

The Line- and ColumNumer of the Exception are Pointing at the <GridView> of my ListView (.View).This is the First ListView

<ListView ItemsSource="{Binding Path=MyObjectCollection, Mode=OneWay}" SelectedItem="{Binding Path=Selected, Mode=OneWayToSource}">
<ListView.View>[code]....

So. How can I bind to the Collection Property of an Object could be nothing?