code: function(parent, records, toAdd) {
          var me = this,
              ln = records ? records.length : 0,
              i, record;
  
          // recursive is hardcoded to true in TreeView.
          if (!me.recursive && parent !== me.node) {
              return;
          }
  
          if (parent !== this.node && !me.isVisible(parent)) {
              return;
          }
  
          if (ln) {
              // The view items corresponding to these are rendered.
              // Loop through and expand any of the non-leaf nodes which are expanded
              for (i = 0; i < ln; i++) {
                  record = records[i];
  
                  // Add to array being collected by recursion when child nodes are loaded.
                  // Must be done here in loop so that child nodes are inserted into the stream in place
                  // in recursive calls.
                  toAdd.push(record);
  
                  if (record.isExpanded()) {
                      if (record.isLoaded()) {
                          // Take a shortcut - appends to toAdd array
                          me.handleNodeExpand(record, record.childNodes, toAdd);
                      }
                      else {
                          // Might be asynchronous if child nodes are not immediately available
                          record.set('expanded', false);
                          record.expand();
                      }
                  }
              }
          }
      }
docs: Collects child nodes to remove into the passed toRemove array. When available, all descendant nodes are pushed into that array using recursion.