'Return the bounding box for the given table cell, relative to
this widget\'s top-left corner.  The bounding box is a tuple
of integers ``(left, top, width, height)``.'

def bbox(self, row, col):

    (dx, dy, _, _) = self.grid_bbox(row=0, column=col)
    (x, y, w, h) = self._listboxes[col].bbox(row)
    return ((int(x) + int(dx)), (int(y) + int(dy)), int(w), int(h))
