title: How to make child Tree Items checked/un-checked if parent Tree was made checked/un-checked
body: <p>I'm having a Check-box Tree View structure, consisting of parent and child nodes.</p>
  
  <p>I want to make all the child nodes [of the parent node] appear as checked if parent Tree is checked. Similarly, if parent Tree is unchecked then its childrens should be unchecked.</p>