title: check child nodes of a tree when a parent is clicked [ExtJS]
body: <p>I would like to know how can i check the sibling nodes of a tree while clicking on a particular node in ExtJs.</p>
  
  <p>I had given id's for each node and i can access the id of a clicked node. then how can i proceed to checking the child nodes automatically ??</p>
  
  <p>somebody please help me..</p>