The zero-based index at which excelStyle should be inserted.
excelStyle
The ExcelStyle to insert into the CustomStyleList
Return Value
The unique ID of the style to be used when referencing the ExcelStyle object in an XMLSS element's StyleID attribute.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2