title: WPF Listbox layout: multiple columns
body: <p>I have a ListBox (WPF) that contains CheckBoxes. I'm using is in a configuration screen. Schematic example below:</p>
  
  <p><img src="https://i.stack.imgur.com/rvjgO.png" alt="alt text"></p>
  
  <p>Now I want to add a "Test 5" CheckBox. I have limited vertical space, so I want it to appear in the horizontal direction, as shown below:</p>
  
  <p><img src="https://i.stack.imgur.com/wrQjP.png" alt="alt text"></p>
  
  <p>Can the ListBox layout be modified so the CheckBoxes will be arranged like this?</p>