Flex :: Sorting - Get Value In ComboBox

I have a one comboBox that I fill as:
for (var key:String in values) {
conns.addItem(key);
}

After that I sorted my ComboBox as:
private function sortConnection():void {
var dataSortField:SortField = new SortField();
dataSortField.name = "data";
dataSortField.numeric = true;
var numericDataSort:Sort = new Sort();
numericDataSort.fields = [dataSortField];
conns.sort = numericDataSort;
conns.refresh();
}

And on finish I want to select item on my specific value in ComboBox. How can I do that? I try:
for (var ii:Number=0; ii<combo.rowCount; ii++) {
var item:String = combo.getChildAt(ii);
if (item == name) {
index = ii;
}}
But does not work. I do not know where I made mistake, and how I can select on specific item in my combobox.