How to make HyperlinkButton navigate to an existing instance of a .xaml view?
<HyperlinkButton NavigateUri="/Admin" TargetName="ContentFrame" Content="Admin"/>


<Border x:Name="ContentBorder" >
    <navigation:Frame x:Name="ContentFrame" Source="/Home" >
        <navigation:Frame.UriMapper>
            <uriMapper:UriMapper>
                <uriMapper:UriMapping Uri="/{pageName}" MappedUri="/Views/{pageName}.xaml"/>
            </uriMapper:UriMapper>
        </navigation:Frame.UriMapper>
    </navigation:Frame>
</Border>