I am working on an existing project which is developed in 6.0 what problems will i have with the existing code to directly use on 7.0

In my existing application we have lot of .vcx components will i be able to use them directly from 6.0 to 7.0 or need any modifications to those objects.

Do i need to make any changes to the existing code to work on 7.0 version of foxpro.