"ToggleGrayBox"

"ToggleGrayBox" is a front end token that sets or unsets the options CellFrame and Background to give the selected cells a gray box or to remove the gray box if the selected cells have one.

This token is equivalent to the menu command Format Background Color Cell Gray Box.

To execute a front end token, you typically evaluate a command of the form FrontEndExecute[FrontEndToken[token]].