

<link rel="import" href="../../bower_components/polymer/polymer-element.html">

<dom-module id="tree-view">
  <template strip-whitespace>
    <style>
       :host {
        display: inline-block;
        position: relative;
        width: 100%;
        height: 100%;
        background: var(--dark-grey);
      }

      button {
        border: none;
        font-size: 13px;
        display: block;
        padding: 4px 0;
        cursor: pointer;
        width: 100%;
        text-align: left;
        displa