[SILVERLIGHT 5.0] Do we need to consider the zoomfactor while calculating the position of UIElement

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Silverlight

I am trying to calculate the position[point] of UIElement on browser. I am considering the zoom factor.
I have following extension method to do it:

public static Point GetPosition(this UIElement element)
       {
           var gt = element.TransformToVisual(Application.Current.RootVisual);
           var position = gt.Transform(new Point(0, 0));
           var zoomFactor = Application.Current.Host.Content.ZoomFactor;   //Adjust to Browser Zooming.
           return new Point(position.X * zoomFactor, position.Y * zoomFactor);
       }

But when I change the browser zoom other than 100% [less or greater], it does not work in expected way.

If I do not consider the zoomfactor while calculating the point of UIElemet, its behavior is expected[for any zoom factor].

But I dont see anywhere mentioned that we have to consider zoomfactor or not.

And one more fact that this piece of code was working with SL 2 OR SL 3.

Any input/fact is appreciated.

Thanks in advance.

-Sumit