title: Implement file explorer based on tree view with multiple selection
body: <p>I`m beginner WPF. I developing a new project at my work and I need to insert a file explorer control with multiple selection.</p>
  
  <p>The concept need to be similar to acronis file explorer: (Treeview with checkboxes)</p>
  
  <p><img src="https://i.stack.imgur.com/X6KLk.jpg" alt="See Example"></p>
  
  <p>Look at the left container, I need to implement something similar to this,
  I habe searched alot through google and I saw lot of implementations but nothing wasn`t similar to this.</p>
  
  <p>Because I don`t have alot experience in WPF it quite difficult for me to start.</p>
  
  <p>Do you have some tips or similar projects which might help me do it?</p>
  
  <p>My project based on MVVM DP.</p>
  
  <p>Thanks</p>