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<ScrollViewer Name="scrollView" Height="220">
<TextBox Name="txtMessage" HorizontalAlignment="Left" Width="450" AcceptsReturn="True" TextWrapping="Wrap" InputScope="Text" TextChanged="txtMessage_TextChanged"/>
</ScrollViewer>
private void txtMessage_TextChanged(object sender, TextChangedEventArgs e)
{
if (scrollView.VerticalOffset < scrollView.ScrollableHeight)
scrollView.ScrollToVerticalOffset(scrollView.ScrollableHeight);
}