The WPF Label control is powerful, but if you simply set Content property to a string, it will not wrap on multiple lines. What to do? Use TextBlock:

<Label >

<TextBlock TextWrapping=”Wrap”>

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi a est libero. Nulla quis purus in est suscipit fringilla. Aliquam.

</TextBlock>

</Label>

Notice TextWrapping property on TextBlock which specifies that text should wrap.

And if you need to use access key in label then wrap text into the AccessText instead like so: