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Add a PropertyChangedValueCallback to Any Dependency Property

<Window x: Class="WpfApplication1.Window1"   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   Title=" " Height="300" Width="300" Loaded="Window1_Loaded">   <Grid>     <Viewbox>       <TextBox x:Name="tbxEditMe" Text="Edit Me..." />     </Viewbox>         </Grid> </Window> //File:Window.xaml.vb Imports System Imports System.ComponentModel Imports System.Windows Imports System.Windows.Controls Namespace WpfApplication1   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()     End Sub     Private Sub Window1_Loaded(sender As Object, e As RoutedEventArgs)       Dim descriptor As DependencyPropertyDescriptor = DependencyPropertyDescriptor.FromProperty(TextBox.TextProperty, GetType(TextBox))       descriptor.AddValueChanged(tbxEditMe, AddressOf tbxEditMe_TextChanged)     End Sub     Private Sub tbxEditMe_TextChanged(sender As Object, e As EventArgs)       MessageBox.Show("", "changed")     End Sub   End Class End Namespace