finding turkish characters in like expression

[lantis system]

hello all...
 
i use memory expression and filter.  FilterObjects returns an empty list if the 
expression to be filtered has Turkish characters.

For example
Expression exp = XXX.yyy.likeIgnoreCase('%turkish 
characters(ğüşiöçĞÜŞİÖÇ)%')

and 

List list = exp.filterObjects(mylist) ; 

Unfortunately list result  is empty.   


Thank you in advance