title: Subitems in Listview not showing
body: <p>I created a program where you can put text in a richtextbox with a button. When the button is clicked the text from this textbox is put in a listview with a checkbox on each line. This listview only has 1 column. </p>
  
  <p>Now, I want to put some lines in as a subitem and to remove the checkbox from the parents, like a tree. However, I only see the parents at the moment, the subitems are not showing. I also don't know how to remove the checkbox from the parents. </p>
  
  <p>I saw the treeview class, but I don't want the those dots before each line and I don't know if you can add checkboxes there.</p>
  
  <p>This is my code</p>
  
  <pre><code>    private void ParseButton_Clicked(object sender, EventArgs e)
      {
         string[] entries = rawLogBox.Text.Split(new string[] { "\r\n", "\n" }, StringSplitOptions.None);
  
         ListViewItem parent = null;
         foreach (string entry in entries)
         {
             if (Regex.IsMatch(entry, "^={10} .* ={10}$"))
             {
                 parent = new ListViewItem(entry);
                 parsedLogBox.Items.Add(parent);
             }
             else
             {
                 if (parent == null)
                 {
                     parsedLogBox.Items.Add(new ListViewItem(entry));
                 }
                 else
                 {
                     new ListViewItem.ListViewSubItem(parent, entry);
                 }
             }                 
         }
         parsedLogBox.AutoResizeColumns(ColumnHeaderAutoResizeStyle.ColumnContent);
      }
  </code></pre>
  
  <p>The listview is set to detail.</p>