# Locking TreeGrid Example

This example is an advanced tree example. It illustrates:

- Locked columns
- Multiple headers
- Preloading of nodes with a single AJAX request
- Header hiding, showing, reordering and resizing
- useArrows configuration
- Keyboard Navigation
- Discontiguous selection by holding the CTRL key
- Using custom iconCls
- Animation disabled because the right side is a normal grid (which does not animate record insertion).

Note that the js is not minified so it is readable. See locking-treegrid.js.