title: Adding 2 listbox to tabpage
body: <p>I wanted to add two listbox to a same tabpage. However, when I run the code below, it only add one.</p>
  
  <pre><code>TabPage frontPage = new TabPage();
  frontPage.Text = "Summary";
  tabControl1.TabPages.Add(frontPage);
  ListBox listBox1 = new ListBox();
  ListBox listBox2 = new ListBox();
  frontPage.Controls.Add(listBox1);
  frontPage.Controls.Add(listBox2);
  </code></pre>