How to avoid the anchor from opening and navigating to another web page?

Hi all,

I have a panel which includes the widget HTML, as you know it's kind of SPAN or DIV something, and each time when I get the html content from server side I will populate the widget like:
myWidget.setHTML(htmlContent); It works well but one thing that is if the html content has anchor inside and each time when user clicks it a new url will be visit and the whole gwt application will be gone, that means it's out of control then. Then how to stop this happening is a headache of mine.
I tried this code to add a handler to the click event each time when the HTML widget is clicked and if the target is an anchor then add a '_blank' target to it.
//                //com.google.gwt.dom.client.Element e = Element.as(event.getNativeEvent().getEventTarget());
//
//                    if(e.getNodeName().equalsIgnoreCase("A")) {
//                        String targetUrl=e.getAttribute("target").trim();
//                        if(targetUrl==null || targetUrl.equals(""))
//                        {
//                            e.setAttribute("target", "_blank");
//                        }
//                    }
This used to work but recently I found it becomes invalid, each time the handler is triggered the event target is always the "SPAN" no matter what objects I clicked.Is there anything wrong? I was using GTW 2.5 and now 2.6. Is it caused by the GWT? or the version of the browser? Appreciate if someone can shed a light on me, thanks.

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