Newline in a WPF-label?

Question

How can I add a newline in the text of a label in WPF such as the following?

Lorem 
  ipsum

Answer 1

An example of how to add a ToolTip with multiple lines to a control, such as a button. The tooltip is width limited so it will wrap if a sentence is too wide.

Tested on VS2019 + .NET 4.6.1 + WPF.