Component-based programming is about how to create application
programs by prefabricated components with new software that provides
both glue between the components, and new functionality.  Models of
components are required to support black-box compositionality and
substitutability by a third party as well as interoperability.
However, the glue codes and programs designed by users of the
components for new applications in general do not require these
features, and they can be even designed in programming paradigms
different from those of the components. In this paper, we extend the
rCOS calculus of components with a model for glue programs and
application programs that is different from that of components. We
study the composition of a glue program with components and prove that
components glued by a glue program yield a new component.