Checks the spelling of an object.
This method has no return value; Microsoft Excel displays the Spelling dialog box. To check headers, footers, and objects on a worksheet, use this method on a Worksheet object. To check only cells and notes, use this method with the object returned by the Cells property.
The following arguments are optional
CustomDictionary (String) - A string that indicates the file name of the custom dictionary to be examined if the word isn't found in the main dictionary. If this argument is omitted, the currently specified dictionary is used.
IgnoreUppercase (Boolean) - True to have Microsoft Excel ignore words that are all uppercase. False to have Excel check words that are all uppercase. If this argument is omitted, the current setting will be used.
AlwaysSuggest (Boolean) - True to have Excel display a list of suggested alternate spellings when an incorrect spelling is found. False to have Excel wait for you to input the correct spelling. If this argument is omitted, the current setting will be used.
SpellLang - The language of the dictionary being used. Can be one of the MsoLanguageID values