tree-view&gt;
  &lt;px-tree-view-node header=&quot;Components (double click to expand)&quot;&gt;
    &lt;px-tree-view-node header=&quot;Layout&quot;&gt;
      &lt;px-tree-view-node header=&quot;FlexPanel&quot;&gt;&lt;&#x2F;px-tree-view-node&gt;
      &lt;px-tree-view-node header=&quot;GridPanel&quot;&gt;&lt;&#x2F;px-tree-view-node&gt;
    &lt;&#x2F;px-tree-view-node&gt;
    &lt;px-tree-view-node header=&quot;Navigation&quot;&gt;
      &lt;px-tree-view-node header=&quot;TreeView&quot;&gt;&lt;&#x2F;px-tree-vi