B4J Question Sorting TreeTableView

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Private xui As XUI 
    Private Button1 As B4XView
    Private TreeTableView1 As TreeTableView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.RootPane.LoadLayout("Layout1")
    MainForm.Show
    Dim parent As TreeTableItem = TreeTableView1.Root
    TreeTableView1.SetColumnSortable(0, False)
    TreeTableView1.SetColumnSortable(1, False)
    For i = 1 To 10
        Dim t As TreeTableItem
        t.Initialize("", Array(Rnd(1, 100), Rnd(1, 100), Rnd(1, 100)))
        parent.Children.Add(t)
    Next
    Dim r As Reflector 'jReflection library
    r.Target = TreeTableView1
    r.AddEventFilter("TreeTableView", "javafx.scene.input.MouseEvent.MOUSE_CLICKED")
End Sub
Sub TreeTableView_Filter(e As Event)
    Dim jo As JavaObject = e
    Dim target As B4XView = jo.RunMethod("getTarget", Null)
    Do While target.IsInitialized
        If GetType(target) = "javafx.scene.control.skin.TableColumnHeader" Then
            jo = target
            Dim children As List = jo.RunMethod("getChildrenUnmodifiable", Null)
            For Each c As B4XView In children
                If c Is Label Then
                    TreeHeaderClicked(c.Text)
                End If
            Next
            e.Consume
        End If
        target = target.Parent
    Loop
End Sub

Sub TreeHeaderClicked (ColumnTitle As String)
    Log("Click: " & ColumnTitle)
End Sub

"com.sun.javafx.scene.control.skin.TableColumnHeader"

"javafx.scene.control.skin.TableColumnHeader"

If GetType(target) = "javafx.scene.control.skin.TableColumnHeader" Or GetType(target) = "com.sun.javafx.scene.control.skin.TableColumnHeader" Then

If GetType(target).EndsWith("javafx.scene.control.skin.TableColumnHeader") Then