ItemCollection edited client side not available serverside

[Timothy]

I've been able to edit the collection of client side items of the drop down list.
My problem is, these edits aren't accessible on the server side.
When a postback occurs, I only see the original list item collection.

I don't see what I've done wrong. Here's what I've got so far:

var ddl = $find("<%=_ddlLidsIndicators.ClientID%>");
ddl.get_items().clear();

var selectItem = new Telerik.Web.UI.DropDownListItem();
selectItem.set_text("Select...");
ddl.get_items().add(selectItem);

$.each(data, function (index, value) {
    var newItem = new Telerik.Web.UI.DropDownListItem();
    newItem.set_text(value);
    newItem.set_value(index);
    ddl.get_items().add(newItem);
});

var otherItem = new Telerik.Web.UI.DropDownListItem();
otherItem.set_text("Other");
ddl.get_items().add(otherItem);

ddl.commitChanges();

[Timothy]

duplicate post. please delete.