title: Get if any RadioButton in a Groupbox was checked
body: <p>I have a Windows Forms application, where I have several radio buttons stored in a <code>GroupBox</code>. I need to enable a different <code>GroupBox</code> based on the selected radio button.</p>
  
  <p><code>groubBox.Enter</code> doesn't seem to be the <code>EventHandler</code> I was looking for. Is there any way to do it my way or do I have to create a handler for each <code>radiobutton.CheckedChanged</code>?</p>
  
  <p><strong>Edit</strong></p>
  
  <p>The workflow of the application is:</p>
  
  <p>A file gets selected → The <code>GroupBox</code> gets enabled → A <code>Panel</code>/<code>ComboBox</code>, <code>TextBox</code> gets enabled depending on the selected <code>RadioButton</code></p>