Extended List Box Isssue

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Silverlight

Hi,

I am using ExtendedListBox in which when i select the perticular item in the list box it is selected but when i click outside or in the blank space of the list box the first item get rectangular border. I want to avoid that border.
there is no facility for sending attachment with the question otherwise i will sen you the image regarding my issue.

<local:extendedlistbox x:name="extListBox" itemssource="{Binding Data}" selectionmode="Extended" clickonselecteditemaction="KeepSelectionIfItemSelected" xmlns:x="#unknown" xmlns:local="#unknown">
            <local:extendedlistbox.itemtemplate>
                <datatemplate>
                    <textblock text="{Binding UserName}"></textblock>
                </datatemplate>
            </local:extendedlistbox.itemtemplate>
        </local:extendedlistbox>

Thanks,
Umesh Tayade