title: Get all Checkboxes in Winform / UserControl by reflection
body: <p>I would like to add a dynamic <code>CheckAll()</code> method to check all checkboxes declared in my class.</p>
  
  <p>I tried following code:</p>
  
  <pre><code>class MyContol : UserControl
  {
    ///
    ///  HIDDEN but there is plenty of checkboxes declaration
    ///
  
    private void CheckAll()
    {
      FieldInfo[] props = this.GetType().GetFields();
  
      foreach (FieldInfo p in props)
      {
        if (p.FieldType is CheckBox)
        {
           /// TODO: Check my box
        }
      }
    }
  }
  </code></pre>
  
  <p>... but <code>props</code> is empty. I have no idea how to target checkboxes made with designer part.</p>
  
  <p>Do you know using <code>Reflection</code> how to target added by design view components?</p>