Opening Hyperlink from document viewer via Touch event in WPF C#

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C#

WPF

Hi, I have a word document and opening in document viewer in WPF C#. word document is having some hyperlinks, to function these links I have added RequestNavigateEvent event handler so it's working fine but not working in touch device on touch of these links. My code is like this...
public MsDocumenViewer()
{
InitializeComponent();
documentViewer1.AddHandler(Hyperlink.RequestNavigateEvent, new RequestNavigateEventHandler(link_RequestNavigate));
}

void link_RequestNavigate(object sender, RequestNavigateEventArgs e)
{
string urlwithJunkCharacter = e.Uri.ToString();
}

Please help me to achieve this.
Thanks.