How to check all options in Radcombox default?

I have two separator in telerik Radcombox box but when i opening the Radcombox it giving the count for separator also.

how i get rid form the count of separator’s?

My code-
<telerik:RadComboBox ID="RadComboBoxSites" runat="server" OnClientItemChecked ="OnClientItemChecked" OnClientItemChecking="OnClientItemChecking" CheckBoxes="true" EnableCheckAllItemsCheckBox="true"DataTextField="SiteName" DataValueField="SiteUid" AppendDataBoundItems="true" OnItemDataBound="RadComboBoxSites_ItemDataBound" OnClientDropDownOpening="setDropdownAttributes" EmptyMessage="Please select a site..." MaxHeight="192px"></telerik:RadComboBox>

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