code: function positionAndFocusMenu() {
          return $q(function(resolve) {
            if (opts.isRemoved) return $q.reject(false);
  
            var info = calculateMenuPositions(scope, element, opts);
  
            info.container.element.css(animator.toCss(info.container.styles));
            info.dropDown.element.css(animator.toCss(info.dropDown.styles));
  
            $$rAF(function() {
              element.addClass('md-active');
              info.dropDown.element.css(animator.toCss({transform: ''}));
  
              resolve();
            });
  
          });
        }
docs: Initialize container and dropDown menu positions/scale, then animate
  to show.