Materials Category()


Hi everybody.
I know its a long shot but i create a plugin for 3dsmax all part works perfectly and every object is on their places but Materials always showing in general material category and Category() function not work at all.
i tried many things and solutions but none of them work.

here is the line that should create a new category in the material editor :

virtual const TCHAR* Category() { return _T(“Materials\lux”);}

work for all other categories but for materials, i know it probably a simple issue but not work for me.

i appreciate any kind of help.