  We study the formation of gap solitons in the presence of parametric pump. It
is shown that parametric pump can stabilize stationary solitons continuously
emitting dispersive waves. The resonant interactions of the radiation and the
solitons are studied and it is shown that the solitons can be effectively
controlled by the radiation. In particular it is shown that the solitons can
collide or to get pinned to inhomogeneities due to the interactions mediated by
the resonant radiation.
