Release 10.1A: OpenEdge Development:
Progress Dynamics Basic Development

> ## Subclassing dynamic combos and lookups

> Beginning in Progress Dynamics Version 2.1B, the underlying class structure of combos and lookups changed. The change supports the performance enhancements and new client data caching scheme. (See the chapter in OpenEdge Development: Progress Dynamics Advanced Development about the client data cache and caching of dynamic combos and lookups.) The old class structure had`Field` as the parent class and`DynCombo` and `DynLookup` as children. The new class structure inserts a new parent class called `LookupField` between `Field` and `DynCombo` and `DynLookup`.

> The normal way to create custom subclasses here would have been to subclass`DynCombo` or `DynLookup`. If you did this, the new class structure should not affect your code. In the future, you should continue to subclass `DynCombo` and `DynLookup`. `LookupField` should not be subclassed.

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