title: WPF ListBoxItem Not Filling
body: <p>In a listbox, when I select an item I still get some kind of border or space around my listboxitem creating the line you see in the image. I want to remove that line I put a circle around.</p>
  <p>It already has <code>HorizontalContentAlignment = &quot;Stretch&quot;</code> by the way.</p>
  <p>What am I doing wrong?</p>
  <h3>The problem:</h3>
  <p><img src="https://lh3.ggpht.com/_ZjKW281-SXM/Sa9CsgxF42I/AAAAAAAAAMg/a2uH99NzAlA/FillProblem.jpg" alt="alt text" /></p>