title: WinForm propertygrid Collection Editor Add/Remove buttons Inactive
body: <p>I am using the generic propertygrid to edit values from several custom classes.  Some of these classes have collections and I can open those collections without a problem in the Collection Editor without a problem. If the collection already contains objects I am able to select those objects and edit them on the right, but the the Add/Remove buttons are inactive.</p>
  
  <p>I know for some of these collections are going to need a custom editor as they are quite complicated-- but most of them are quite simple. Is there an easy way active the add/remove buttons for these simple classes or do I need to create a custom editor for every collection?</p>