[android-developers] ListPopupWindow - align to right edge of the anchor

I am creating a custom drop down "menu" initiated from the action bar in a tablet application.
When the button is pressed in the action bar, I need the ListPopupWindow to align it's right edge with the right edge of the action view "button".

However, I have not be able to find how to do this.
Can it be done - or will I need to create my own implementation of this ?

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