very fast solution:

<igEditors:XamTextEditor >

<igEditors:XamTextEditor.Resources>

<Style TargetType="{x:Type TextBox}">

<Setter Property="AcceptsReturn" Value="True"/>

</Style>

</igEditors:XamTextEditor.Resources>

</igEditors:XamTextEditor>

The TextBox is part of the infrastructure of the XamTextBox. Thus the name given the TextBox is used by the template.

If you want to use the shortcut I added for only one XamTextBox, assign the style to just the XamTextBox:

<igEditors:XamTextEditor>
    <igEditors:XamTextEditor.Resources>
        <Style TargetType="{x:Type TextBox}">
            <EventSetter Event="TextChanged" Handler="OnTextChanged"/>
        </Style>
    </igEditors:XamTextEditor.Resources>
</igEditors:XamTextEditor>

Curtis, I understand that using your above example if I had multiple controls of type "XamTextEditor", that the OnTextChanged event would fire for all of them.  Is this right?

 If I wanted to change the height of only one XamTextEditor, how would I do it?

I tried the following, where "txtXamTextEditor" was the name of the instance of the XamTextEditor I'd like this code to execute on:

 Private Sub OnTextChanged(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
    Dim iLineCount As Integer = 0
    Dim oTextBox As TextBox

    If TypeOf sender Is TextBox Then
      oTextBox = CType(sender, TextBox)
      If oTextBox.Name = txtXamTextEditor.Name Then
        iLineCount = oTextBox.LineCount
        Select Case iLineCount
          Case 1
            oTextBox.Height = 25
          Case 2
            oTextBox.Height = 50
          Case Else
            ' I'm doing something else, it doesn't matter
        End Select
      End If
    End If
  End Sub

But it didn't work since oTextBox.Name was "PART_FocusSite", the name of the textbox inside the "Edit Control Template".

A WPF TextBox is part of the architecture behind the XamTextEditor. The TextBox manages the rudimentary text editing. To access the underlying TextBox control you either need to use the VisualTreeHelper or you can access it by capturing a TextBox event.

The following is a shortcut for accessing the TextBox when the user makes an edit. The following resource will call an event handler for all TextBoxes found in the Window:

<Window.Resources>
    <Style TargetType="{x:Type TextBox}">
        <EventSetter Event="TextChanged" Handler="OnTextChanged"/>
    </Style>
</Window.Resources>