title: How can I make TextBox controls read-only when they are inside a disabled GroupBox?
body: <p>I have a <code>GroupBox</code> control in my Windows Forms application, inside of which I have placed some <code>TextBox</code> controls. How can I disable the <code>GroupBox</code> control while making the individual <code>TextBox</code> controls read-only? </p>
  
  <p>Whenever I disable the <code>GroupBox</code>, all of the <code>TextBox</code> controls inside of it get disabled as well. I can't figure out how to make them read-only.</p>