how to remove HyperlinkButton 'box' when clicked

[Paris]

Hi,

I have a hyperlink button in my gridview, I wanna remove the 'box' when i click on the button. Someone please guide me to solve this problem. Thanks.

<telerik:GridViewDynamicHyperlinkColumn Header="Invoice No." Width="*" >
    <telerik:GridViewDynamicHyperlinkColumn.CellTemplate>
        <DataTemplate>
            <HyperlinkButton TargetName="_blank" Content="{Binding InvoiceNo}" NavigateUri="http://localhost:60271/Pages/Invoice.aspx"></HyperlinkButton>
        </DataTemplate>
    </telerik:GridViewDynamicHyperlinkColumn.CellTemplate>
</telerik:GridViewDynamicHyperlinkColumn>