I created a user control to handle vendors info (add, updated, etc), now I'm trying to add another user control I created for Ship-methods and once I add the user control to the vendor user control I got this error:

Compile error:

Private object modules cannot be used in public obj modules as parameters or return types for public procedures, as public data members, or as fields of public user defined types.


What is this?....how can I add a user control to another user control?