wn',

    behaviors: [
      Polymer.NeonAnimationRunnerBehavior
    ],

    properties: {

      animationConfig: {
        type: Object,
        value: function() {
          return {
            'entry': [{
              name: 'scale-up-animation',
              node: this,
              transformOrigin: '0 0'
            }],
            'exit': [{
              name: 'fade-out-animation',
              node: this
            }]
          }
        }
      },

      _showing: {
        type: Boolean,
   