title: programmatically expand a tree inside a dojox.TreeGrid
body: <p>I have a simple tree grid and i need to programmatically expand a row to show its children. In essence i need to fake the click event that triggers the opening of the tree. 
  see and example here <a href="http://archive.dojotoolkit.org/nightly/dojotoolkit/dojox/grid/tests/test_treegrid_model_lazy.html" rel="nofollow">http://archive.dojotoolkit.org/nightly/dojotoolkit/dojox/grid/tests/test_treegrid_model_lazy.html</a></p>