title: Popup for Listview
body: <p>Goal:<br>
  When you have the cursor in one of of the listview's row, a pop up, with text information, should display.  </p>
  
  <p>If you select a new row in the listview a new text information should display.</p>
  
  <p>Problem:<br>
  How should I do it? I cannot find a tutorial for it?  </p>
  
  <p>Information:<br>
  - The size of the popup is the same.<br>
  - I'm using C# with WPF.  </p>
  
  <p><img src="https://i.stack.imgur.com/mk3ay.png" alt="enter image description here"></p>