title: Add object to a BindingList in a BindingList
body: <p>I have a bindinglist of activity, and each activity has a bindinglist of BuyOrders</p>
  
  <pre><code>bindingListActivty.Select(k =&gt; k._dataGridViewId == 1);
  </code></pre>
  
  <p>If I understand correctly, i can select the activity, but I cannot access any method inside the activity. How do I access the method without creating a new instance of a bindinglist ?</p>
  
  <p>I tought this would work, but no</p>
  
  <pre><code>bindingListActivty.Select(k =&gt; k._dataGridViewId == 1).addBuyOrders(new BuyOrders());
  </code></pre>