  We address the properties and dynamical stability of one-dimensional vector
lattice solitons in Kerr-type cubic medium with harmonic transverse modulation
of refractive index. We discovered that unstable families of scalar lattice
solitons can be stabilized via the cross-phase modulation (XPM) in the vector
case. It was found that multi-humped vector solitons that are unstable in
uniform media where XPM strength is higher than that of self-phase modulation,
can also be stabilized by the lattice.
