New Post: ComboBox in CollectionControl

This works. However I have a follow up question.

How do I get the selected item of the combobox (in the CollectionControl)?

For example in my case the objects listed in the comboBox are Fabrics
I thought maybe I need to add a SelectedFabric property to the class and then add SelectedValue="{Binding SelectedFabric}" and SelectedValuePath in the ComboBox EditorTemplateDefinition, e.g. in Xceed.Wpf.Toolkit/CollectionControl/Themes/Generic.xaml

<pg:PropertyGrid Grid.Row="1"
                                         Grid.Column="1"
                                         Margin="0,5,0,0"
                                         HorizontalAlignment="Stretch"
                                         VerticalAlignment="Stretch"
                                         SelectedObject="{Binding SelectedItem, RelativeSource={RelativeSource TemplatedParent}}"
                                         IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}">
                                    
                                    <pg:PropertyGrid.EditorDefinitions>

                                        <pg:EditorTemplateDefinition TargetProperties="ListOfFabrics">
                                            <pg:EditorTemplateDefinition.EditingTemplate>
                                                <DataTemplate>
                                                    <ComboBox ItemsSource="{Binding Value}" SelectedValue="{Binding SelectedFabric}" SelectedValuePath="FabricID"/>
                                                </DataTemplate>
                                            </pg:EditorTemplateDefinition.EditingTemplate>
                                        </pg:EditorTemplateDefinition>
                                        
                                    </pg:PropertyGrid.EditorDefinitions>
                                    
                                </pg:PropertyGrid>

where I have

Public Class FabricLayer

    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 myThickness As Double
    Public myListOfFabrics As New List(Of Fabric)
    Public mySelectedFabric As Integer

    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

    Public Property ListOfFabrics As List(Of Fabric)
        Get
            Return myListOfFabrics
        End Get
        Set(ByVal value As List(Of Fabric))
            myListOfFabrics = value
        End Set
    End Property

    Public Property SelectedFabric As Integer
        Get
            Return mySelectedFabric
        End Get
        Set(ByVal value As Integer)
            mySelectedFabric = value
            OnPropertyChanged(New PropertyChangedEventArgs("SelectedFabric"))
        End Set
    End Property

and

    Public Class Fabric
        Implements INotifyPropertyChanged

        Public myGUID As String
        Public myDisplayColour As System.Windows.Media.Color
        Public myDescription As String

        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()
            myGUID = Guid.NewGuid.ToString
            myDisplayColour = Colors.Blue
            myDescription = "New Fabric"
        End Sub

        Public Sub New( _
           ByVal newGUID As String,
           ByVal newDisplayColour As System.Windows.Media.Color,
           ByVal newDescription As String,
           )
            myGUID = newGUID
            myDisplayColour = newDisplayColour
            myDescription = newDescription
        End Sub

        Public Property FabricID() As String
            Get
                Return myGUID
            End Get
            Set(ByVal value As String)
                myGUID = value
                OnPropertyChanged(New PropertyChangedEventArgs("FabricID"))
            End Set
        End Property

        Public Property DisplayColour() As System.Windows.Media.Color
            Get
                Return myDisplayColour
            End Get
            Set(ByVal value As System.Windows.Media.Color)
                myDisplayColour = value
                OnPropertyChanged(New PropertyChangedEventArgs("DisplayColour"))
                Call myfrmMDI.pic3DView_Paint()
            End Set
        End Property

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

Apologies for the long reply!