Ahmed.C 0 Junior Poster in Training

I was just wondering, is there a way to change the colour of the squiggly line when a word is misspelled in a WPF TextBox? Here's what I mean:
Click Here

I have no idea as to where to start because I'm simply clueless. I tried editing the Textbox to see if it handles it but it seems like it doesn't. There is no property to change it.