'**SUMMARY**
Returns the position where the right mouse button went down.
.. warning::
You must call :py:meth:`checkEvents` or :py:meth:`isDone`
in your main display loop for this method to work.
**RETURNS**
An (x,y) mouse postion tuple where the mopuse went down.
**EXAMPLE**
>>> disp = Display((600,800))
>>> cam = Camera()
>>> while(disp.isNotDone()):
>>>   img = cam.getImage()
>>>   dwn = disp.rightButtonDownPosition()
>>>   up = disp.rightButtonUpPosition()
>>>   if( up is not None and dwn is not None):
>>>     bb = disp.pointsToBoundingBox(up,dwn)
>>>     img.drawRectangle(bb[0],bb[1],bb[2],bb[3])
>>>   img.save(disp)
**SEE ALSO**
:py:meth:`leftButtonUpPostion`
:py:meth:`leftButtonDownPostion`
:py:meth:`rightButtonDownPostion`
:py:meth:`pointsToBoundingBox`
:py:meth:`checkEvents`'

def rightButtonDownPosition(self):

    return self.rightButtonDown
