title: How to visible treeviewItem expander Arrow show for all child nodes in WPF?
body: <p>I attached my problem screen shot. So refer it, i need only expand arrow icon in tree view  visible to all nodes in first time Load.</p>
  
  <p><a href="https://i.stack.imgur.com/h7pMd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/h7pMd.png" alt="My Problem Image"></a></p>
  
  <p><strong>Problem is  that tree view items don't have children means  arrow not visible .
  But Initial time load i need that arrow visible. After user expand it will hide.</strong> </p>
  
  <p>Root have child nodes. But others not have. So Expand time only i can load.</p>