private void AssociatedObject_KeyDown(object sender, System.Windows.Input.KeyEventArgs e)
{
MyTextBox textBox = sender as MyTextBox;
if (textBox != null)
{
if (e.Key == Key.Return || e.Key == Key.Enter)
{
textBox.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
}
}