Problem passing derived objects

I tried asking this in the VB.Net forum, but didn't get any responses there, so I thought I'd try this topic instead. I'm trying to drag objects from one form to another. I have the mechanics of it working fine, but I want to do something a little different. I have a class called ManagedObject. I also have several classes derived from that class, such as a class called SystemData. Now, what I would like to be able to do is pass one of these derived objects in a dragdrop operation, and have the target form accept any object that is derived from ManagedObject. Right now I have to specify the specific object type in the Drag_Enter event for it to properly recognize the object type. Is it possible to get it to accept any object that derives from ManagedObject?

I can't think of a problem passing an object that derives from a base class and declaring that base class as a parameter. Do you have some code that you can post so I can play a bit with this?