How can we handle Enter key on richTextBox in WPF?

Hi friends.
I want to handle Enter key or Space bar key on richTextBox in WPF.
By KeyDawn event I couldn't do it. :ehh:

Can you help me ?

OK. I found it :

<RichTextBox Name="t" PreviewKeyDown="t_PreviewKeyDown"></RichTextBox>

Yes. In general any WPF event that has a 'Preview' prefix is fired before the operation has occurred.