Devexpress combo: Can't set SelectedIndex higher than 99 on clientside - asp.net

Question

I use a performCallback to add a new item to my ASPxCombo on serverside, and want to change my index to that new item on the client side. I use DevExpress onEndCallback to do this and it is working great if my index is <= 99. Above that the index is not changed.
Do anybody no if DevExpress's SetSelectedIndex() method works with index greater than this, seems a little strange to me.
<dx:ASPxComboBox runat="server"
ID="CmbManufacturer"
ClientInstanceName="cmbManufacturer"
CssClass="dxeButtonEdit_LWDisplayEdit_CustomDropDown"
DropDownStyle="DropDownList"
EnableCallbackMode="True"
OnCallback="CmbManufacturer_Callback"
ValueType="System.String"
FieldName="ID"
TextFormatString="{0}"
FilterBy="Name"
TextField="Name"
ValueField="ID"
EnableSynchronization="False"
AllowEdit="false"
ValidationSettings-Display="None"
AutoPostBack="False"
Visible="False"
Width="400" >
<ClientSideEvents SelectedIndexChanged="function(s,e) {OnManufacturerChanged(s,e); }"
Init="function(s,e) {LwValidating2(s,e);}"
EndCallback="function(s,e) { OnEndCallbackCmbManufacturer(s,e); }"/>
</dx:ASPxComboBox>
function OnEndCallbackCmbManufacturer(s, e) {
var index = s.cpSelectedIndex;
s.SetSelectedIndex(index);
OnManufacturerChanged(s, e);
}

Answer 1

I have solved the problem by moving my new Item in dropdownItemList up in front of list below CallbackpageSize. Then i can change index on combo to the Items new index.
protected void CmbManufacturer_Callback(object source, CallbackEventArgsBase e)
{
var manufacturerName = e.Parameter.Trim();
// need to move item to top of list because it must be lower than CallbackPagesize to work
int indexforNewItem = 1;
try
{
int newManufacturerId = SoftwareManufacturer.Update(-1, manufacturerName, "");
LoadDropDownBoxManufacturer(null);
int newManufacturerIndex = CmbManufacturer.Items.IndexOfText(manufacturerName);
CmbManufacturer.Items.Move(newManufacturerIndex, indexforNewItem);
CmbManufacturer.JSProperties["cpSelectedIndex"] = indexforNewItem;
}
catch ()
{
}
}