How to add to a textbox the red line (like bad spelling in Word)?

Question

How can we produce the effect of the red line under a bad spelling word like the image below :

alt text http://img505.imageshack.us/img505/7253/options285x395rg9.th.

Answer 1

You can use rich edit control's properties and methods to do the drawing of the wavy lines. For more information visit this site: http://geekswithblogs.net/pvidler/archive/2003/10/15/188.aspx