line feed or empty line in XAML text output?

Hi again,

when I write text output to a XAML textbox like this:

$outputtextbox.text = " some text or some more text"

and I want the output text to include a line feed, how can I do that? I tried several things like

"some text ' \r\n' some more text" but it doesn't work.

Any ideas?

Sven