Adding Item into XMLListCollection

Hi
I store my data into a XMLListCollection variable (name XC).
The initial lengt of this XMLListCollection is 10 items (for
example: XC.length==10). I leave the user to filter this data and I
added a filterfunction to this variable. I set another function
named sync() that run every 10 seconds (for example). This function
is trying to insert an element into XC:XMLListCollection at a
specific position (for example 8 XC.additemat(item,8)). After the
user filter the data, the length is 2 and when the sync() function
is activated, this function call "addItemAt(item,8)" and I receive
"Index out of Bound...".
I know how to read the entire list (XMLList) using the
.source properties but I don't know how to insert an element at a
specific position (for example 8).
Please help me (if you know)
Thanks in advance
Cristy

I want to store this variable on the local disk into a
SharedObject. So, if I stored the entire collection (with 10
items), and the server send to the user another item I want to
insert this item into the collection even the item received from
the server is not visible by the user (because of filtefunction).
When the user want to save the data I want to use
sharedobject.flush() and I expect to save the entire collection (11
items). When the user enter again in this form I want to show 11
items and the user can filter this items in multuple ways. Thanks
for your replay.
Cristy

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