1. A computer system for selectively retrieving runtime objects in an application development environment, comprising: a plurality of server runtime objects; a plurality of local runtime objects, each local runtime object including a generation setting associated with generation of the respective local runtime object; and a generator component responsive to a request for a requested runtime object by being configured to retrieve a valid copy of the requested runtime object from the plurality of local runtime objects if therein, and to otherwise retrieve the valid copy of the requested runtime object from the plurality of server runtime objects if therein.