"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]].
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"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.
Background Color 
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