canvas - Get doubletap coordinates in c# windows phone 8 -

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i'm trying best coordinates of finger doubletapped when doubletapped somewhere on canvas, how can accomplish this? have doubletap method this:

        private void app_doubletap(object sender, system.windows.input.gestureeventargs e)     {         //get coordinates(left , top) of doubletapped     }

please me , lot in advance!:)

to position relative page, use:

point point=e.getposition(this);

to position relative canvas (with double tap event regitered on canvas), use:

point = e.getposition(sender uielement);

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