title: EXTJS 5 hide node in treegrid
body: <p>Is there a way to hide a node (a parent or a child) in a treegrid? I set the visible property to false but it does not disappear: (here is the fiddle link: <a href="https://fiddle.sencha.com/#fiddle/jl1" rel="nofollow">https://fiddle.sencha.com/#fiddle/jl1</a>)</p>
  
  <pre><code>var tree = Ext.create('Ext.tree.Panel', {
      renderTo: Ext.getBody(),
      title: 'TreeGrid',
      width: 300,
      height: 250,
      fields: ['name', 'description'],
      columns: [{
          xtype: 'treecolumn',
          text: 'Name',
          dataIndex: 'name',
          width: 150,
          sortable: true
      }, {
          text: 'Description',
          dataIndex: 'description',
          flex: 1,
          sortable: true
      }],
      root: {
          expanded: true,
          children: [{
              name: 'Group 1',
              expanded: true,
              children: [{
                  name: 'Child 1.1',
                  description: 'Description 1.1',
                  leaf: true
              },{
                  name: 'Child 1.2',
                  description: 'Description 1.2',
                  leaf: true
              }]
          }, {
              name: 'Group 2',
              expanded: true,
              children: [{
                  name: 'Child 2.1',
                  description: 'Description 2.1',
                  leaf: true
              },{
                  name: 'Child 2.2',
                  description: 'Description 2.2',
                  leaf: true
              }]
          }]
      }
  });
  
  var button = Ext.create('Ext.button.Button', {
      renderTo: Ext.getBody(),
      text: 'Remove group 1',
      handler: function() {
          var group1 = tree.getRootNode().childNodes[0];
          group1.set('visible', false);
      }
  });
  </code></pre>
  
  <p>Note: I don't want to remove the node, I want to hide it, to show it again later (I want to do this because the remove/add behaviour on tree grid is very bugged :S) !</p>
  
  <p>Thanks in advance :) !</p>