title: WPF treeview needed without indentation
body: <p>I am very new to WPF and developing first form in WPF as I have some specific design and feature requirement in tree-view.</p>
  
  <p>I need to develop a treeview where only root nodes should be indented as default while their treeviewitems should be start from same 0 position, no indentation needed.</p>
  
  <p>Please refer below image for reference - </p>
  
  <p><img src="https://i.stack.imgur.com/VO0y0.png" alt="Reference Image"></p>
  
  <p>Kindly help me to get it done by sharing any solution.</p>