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Reference name defined in Xaml in vb file

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   x:Class="WpfApplication1.IndexOfSample"    WindowTitle="UIElementCollection IndexOf Sample">     <DockPanel Name="ParentElement">         <TextBlock DockPanel.Dock="Top" Name="TxtDisplay"></TextBlock>         <Button DockPanel.Dock="Top" Click="FindIndex">What is the Index Number             of the Element Just Added?</Button>         <DockPanel Name="MainDisplayPanel">             <TextBlock DockPanel.Dock="Top">Text 1</TextBlock>             <TextBlock DockPanel.Dock="Top">Text 2</TextBlock>         </DockPanel>     </DockPanel> </Page> //File:Window.xaml.vb Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Documents Namespace WpfApplication1   Public Partial Class IndexOfSample     Private Sub FindIndex(sender As Object, e As RoutedEventArgs)       Dim newText As New TextBlock()       MainDisplayPanel.Children.Add(newText)       newText.Text = "New element #"       DockPanel.SetDock(newText, Dock.Top)       TxtDisplay.Text = MainDisplayPanel.Children.IndexOf(newText) + ""     End Sub   End Class End Namespace