title: AllowUserToAddRows doesn't work with with List<> Datasource on DataGridView
body: <p>I have a <code>DataGridView</code> with the <code>DataSource</code> set to <code>List&lt;myClass&gt;</code></p>
  
  <p>However, the new row indicator does not display when I set <code>AllowUserToAddRows</code> to <code>true</code>, </p>
  
  <p>When I set the <code>DataSource</code> to <code>BindingList&lt;myClass&gt;</code>, that seems to solve the problem.</p>
  
  <p><em>Q</em>: Should replace my <code>List&lt;&gt;</code> with <code>BindingList&lt;&gt;</code> or there is better solution?</p>