Hmmm...ooops....
The '&' is an escape character in certain Windows controls that is used to specify an underlined character. It is used mostly in menus and dialogs to specify a control's hotkey. We are certainly not doing it on purpose, but it may be that the display function we are using in the doc grid enables that behavior by default. Not sure what it will take to make it go away, but we'll certainly look into it.
Thanks for the heads-up!