  The vertex H^+_\alpha W^-h^0_\beta, involving the gauge boson W^+- and the
charged (H^+-_\alpha) and neutral Higgs bosons (h^0_\beta), arises within the
context of many extensions of the SM, and it can be used to probe the quantum
numbers of the Higgs multiplet. After presenting a general discusion for the
expected form of this vertex with arbitrary Higgs representations, we discuss
its strength for several specific models, which include: i) the Two-Higgs
Doublet Model (THDM), both the generic and the SUSY case, and ii) models with
additional Higgs triplets, including both SUSY and non-SUSY cases. We find that
in these models, there are regions of parameters where the decay H^+_\alpha ->
W^+ h^0_\beta, is kinematically allowed, and reaches Branching Ratios (BR) that
may be detectable, thus allowing to test the properties of the Higgs sector.
