The static scattering function is calculated for a cross-linked blend in the presence of a low molecular weight solvent. The idea suggested by de Gennes to treat analogously the effects of cross-links in a network and those of electric charges in a dielectric medium is generalized to include the concept of screening. It is argued that this generalization could help to resolve the discrepancy between the model and the neutron scattering data in the low q region. Other phenomena are also examined such as the enhancement of compatibility due to cross-links and the kinetics of the microphase separation transition.