WPF Button to scroll Textbox

I have a RichTextBox and a button. Is ther开发者_开发技巧e any easy way to make the textbox scroll down / up when i press the button? my guess is i have to use commands but im not 100% sure how commands work.

There is VerticalOffset property and ScrollToVerticalOffset method you can use:

richTB.ScrollToVerticalOffset(richTB.VerticalOffset - 15);