title: How to make asp.net tree view control to allow only one node to be expanded
body: <p>I have binded the tree view control with my datatable and it has rendered perfectly.</p>
  
  <p>But it allows me to expand as many nodes i click. </p>
  
  <p>Only one node should be expanded at a time. clicking on another node should collapse other nodes. </p>
  
  <p>What event should be fired for this ? any idea ? </p>