New Post: Pass property changes in ObservableCollection back to CollectionControl

Is it possible to pass changes made to properties in an ObservableCollection back to the main CollectionControl?

Suppose I have a simple CollectionControl defined...

<Window x:Class="MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="800" Width="525" xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit">
    <Grid>
        <StackPanel>
            <xctk:CollectionControl Height="240"
                                HorizontalAlignment="Left"
                                Name="CollectionControlElements"
                                VerticalAlignment="Top"
                                Width="479"
                                >

            </xctk:CollectionControl>
                   
        </StackPanel>
    </Grid>
</Window>

with code behind...

Class MainWindow
    Public myConstruction As New clsConstruction

    Public myConstructionCollection As New ObservableCollection(Of clsConstruction)

    Public Sub New()

        ' This call is required by the designer.
        InitializeComponent()

        CollectionControlElements.DataContext = myConstructionCollection
        CollectionControlElements.NewItemTypes = New ObservableCollection(Of System.Type)() From {GetType(clsConstruction)}


    End Sub
    
End Class

where clsConstruction is

Imports System.ComponentModel
Imports System.Collections.ObjectModel
Public Class clsConstruction
    Implements INotifyPropertyChanged

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged

    Public Sub OnPropertyChanged(ByVal e As PropertyChangedEventArgs)
        If Not PropertyChangedEvent Is Nothing Then
            RaiseEvent PropertyChanged(Me, e)
        End If
    End Sub

    Public myLayerCollection As New ObservableCollection(Of clsLayer)
    Public myDescription As String
    Public myTotalThickness As Double

    Public Sub New()
        myDescription = "New Construction"

    End Sub

    Public Property LayerCollection As ObservableCollection(Of clsLayer)

        Get
            Return myLayerCollection
        End Get
        Set(value As ObservableCollection(Of clsLayer))
            myLayerCollection = value
            OnPropertyChanged(New PropertyChangedEventArgs("LayerCollection"))
            OnPropertyChanged(New PropertyChangedEventArgs("TotalThickness"))
        End Set
    End Property

    Public Property Description As String

        Get
            Return myDescription
        End Get
        Set(value As String)
            myDescription = value
            OnPropertyChanged(New PropertyChangedEventArgs("Description"))
        End Set
    End Property

    ReadOnly Property TotalThickness() As Double
        Get
            myTotalThickness = 0.0
            If Not IsNothing(LayerCollection) Then
                If LayerCollection.Count > 0 Then
                    For i = 0 To LayerCollection.Count - 1

                        myTotalThickness = myTotalThickness + LayerCollection(i).Thickness
                    Next
                End If
                Return Math.Round(myTotalThickness, 3)
            End If
        End Get
    End Property
End Class

which contains observablecollection of clsLayer, where clsLayer is...

Imports System.ComponentModel
Imports System.Collections.ObjectModel

Public Class clsLayer

    Implements INotifyPropertyChanged

    Public myThickness As Double

    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged

    Public Sub OnPropertyChanged(ByVal e As PropertyChangedEventArgs)
        If Not PropertyChangedEvent Is Nothing Then
            RaiseEvent PropertyChanged(Me, e)
        End If
    End Sub

    Public Sub New()


    End Sub

    Public Property Thickness() As Double
        Get
            Return myThickness
        End Get
        Set(ByVal value As Double)
            myThickness = value
            OnPropertyChanged(New PropertyChangedEventArgs("Thickness"))
        End Set
    End Property
End Class

I want to be able to change the thickness property in the clsLayer class (via the clsLayer CollectionControl that is automatically generated) and have that change instantly reflected in the clsConstuction CollectionControl.