ActionScript :: Array.sortOn() For Non-English Data?

this is an array of objects that i want to alphabetize:

var streets:Array = new Array();
streets.push({name:"Édouard-Montpetit"});
streets.push({name:"Alexandre de Sève"});
streets.push({name:"Van Horne"});
streets.push({name:"Atwater"});

now i'll sort my array:

streets.sortOn("name", Array.CASEINSENSITIVE);
//Sorted
Alexandre de Sève
Atwater
Van Horne
Édouard-Montpetit

the accent above the E in Édouard-Montpetit, and any other first letter with a non-english accent is sorted after Z.how i can sort this correctly? i do not have access to the named data.