How do I specify a control as a property in my user control in WPF?

My XAML:

<TextBox x:Name="myTextBox" .../>
<MyExtender TargetTextBox=? .../>

My C#:

MyExtender : UserControl
{
    public TargetTextBox { get; set; }
}

How do I set the TargetTextBox property in XAML?

From stackoverflow

• You should be able to do:

  <TextBox Name="tb">Something</TextBox>
  <my:MyExtender TargetTextBox="{Binding ElementName=tb}" />
  

  but this requires TargetTextBox to be a DependencyProperty. Change MyExtender.xaml.cs to:

   public partial class MyExtender : System.Windows.Controls.UserControl
  {
      public MyExtender()
      {
          InitializeComponent();
      }
      public static readonly DependencyProperty TargetTextBoxPropery = 
          DependencyProperty.Register("TargetTextBox", typeof(TextBox), typeof(MyExtender));
  
      public TextBox TargetTextBox
      {
          get { return (TextBox)GetValue(TargetTextBoxPropery); }
          set { SetValue(TargetTextBoxPropery, value); }
      }
  
  }
  

  And you should be set.