extjs4.1 - Showing loading icon on ExtJs 4.1.1 tree panels node when expanded -

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i using extjs 4.1.1 tree panel. 

  xtype: 'treepanel',                  id: 'tpanel',                  flex: 0.68,                  title: 'tree',                  displayfield: 'dataname',                  rootvisible: false,                  usearrows: true,                  hidden: true,                  store: 'mystore'

this tree check tree (shows checkbox). looked following example of xml tree:

http://docs.sencha.com/extjs/4.1.1/#!/example/tree/xml-tree.html

when expand node of tree, shows loading icon.

axis showing loading icon

i want similar within tree panel not able in tree. please help


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