To add a hyperlink in the RadDesktopAlert control, you could set the Content property to a button instance of type RadHyperlinkButton. And then set the button's NavigateUri and Content properties to be equal to the passed URL.
var hyperlinkBtn = new RadHyperlinkButton();
hyperlinkBtn.NavigateUri = new Uri("passed uri");
hyperlinkBtn.Content = "passed uri";
hyperlinkBtn.Foreground = Brushes.Black;
var alert = new RadDesktopAlert
{
Content = hyperlinkBtn,
};
That said, I have prepared a sample project which implements the mentioned approach, so I hope it helps in your scenario.
You can create a custom data template and set it to the ContentTemplate property of the RadDesktopAlert control. That said, I have modified the project from the last ticket reply, to implement the aforementioned approach.