FLEX ArrayCollection がフィルタリングされたデータを削除する問題が解決されました。

public function removeItemAt(index:int):Object
{
if (index < 0 || index >= length)
{
var message:String = resourceManager.getString(
"collections", "outOfBounds", [ index ]);
throw new RangeError(message);
}
var listIndex:int = index;
if (localIndex)
{
var oldItem:Object = localIndex[index];
listIndex = list.getItemIndex(oldItem);
}
return list.removeItemAt(listIndex);
}

public function get list():IList
{
return _list;
}

public function findEmployeeInSource(id:int):OrgEmployee {
var obj:OrgEmployee = null;
var list:IList = employees.list;
var len:int = list.length;
for (var index:int = 0; index < len; index++) {
obj = list.getItemAt(index) as OrgEmployee;
if (obj.id == id) {
return obj;
}
}
return null;
}
public function deleteEmployee(id:int):void {
var obj:OrgEmployee = findEmployeeInSource(id);
if (obj ! = null) {
var index:int = employees.list.getItemIndex(obj);
employees.list.removeItemAt(index);
}
}

public function deleteEmployee(id:int):void {
var obj:OrgEmployee = null;
var list:IList = employees.list;
var len:int = list.length;
for (var index:int = 0; index < len; index++) {
obj = list.getItemAt(index) as OrgEmployee;
if (obj.id == id) {
list.removeItemAt(index);
return;
}
}
}