title: Use component in itself recursively to create a tree
body: <p>Do you know is it possible to use component in itself? If yes,where to read about it?</p>
  
  <p>I have next situation: 
  have list of mainItems, every Main Item has subItem (the same look like mainItem), every subItem can have it's own subItem etc.
  So it better to use nesting,but how?</p>