Call Method on ListCollectionView Changing

Hello

I have created a ListCollectionView property in my ViewModel (named DevicesListCollectionView) and this is the ItemsSource for a ListBox. Some of the properties have a TwoWay binding so that the user can change the values.

I have a 'HasDataChanged' Boolean property which I want to set if the user has changed any of the properties since the ListCollectionView was created.

I cannot seem to find a way to capture the ListCollectionView propertyChanged event so that I can set 'HasDataChanged' .

The Devices_ListCollectionView property 'setter' does not seem to be called when the user changes a value. I must be missing something simple but I can't see it.

Here is my ViewModel property:

    Public Property DevicesListCollectionView() As ListCollectionView
        Get
            If m_DevicesListCollectionView Is Nothing Then
                m_DevicesListCollectionView = Me.AppData.DevicesListCollectionView
            End If
            Return m_DevicesListCollectionView
        End Get
        Set(ByVal value As ListCollectionView)
            m_DevicesListCollectionView = value

            'Pass value back to AppData.
            Me.AppData.DevicesListCollectionView = m_DevicesListCollectionView

            'Debug output.
            Console.WriteLine("DevicesListCollectionView set.")

            Me.HasDataChanged = True

            OnPropertyChanged("DevicesListCollectionView")
        End Set
    End Property

Any suggestions would be very welcome. Thank you.

Chris