title: Dojo treemodel- adding large number of items
body: <p>I am trying to add a large number of items (100+) to my tree via ForestStoreModel by calling newItem in a loop.  This seems to be quite slow and locks up the browser.  Is there any way I can do something similar to grid's beginUpdate &amp; endUpdate?  I want to basically 'turn off' my tree, add 100 items in a batch, then 'turn on' my tree.  Any ideas?  Thanks!</p>