  Influence of the isospin-violating (\rho^0, \omega)-mixing is discussed for
any pair of decays of \rho^0, \omega into the same final state. It is
demonstrated, in analogy to the CP-violation in neutral kaon decays, that
isospin violation can manifest itself in various forms: direct violation in
amplitudes and/or violation due to mixing. In addition to the known decays
(\rho^0, \omega)\to\pi^+\pi^- and (\rho^0, \omega)\to\pi^0\gamma, the pair of
decays to e^+e^- and the whole set of radiative decays with participation of
\rho^0, \omega (in initial or final states) are shown to be also useful and
perspective for studies. Existing data on these decays agree with the universal
character of the mixing parameter and indirectly support enhancement of
\rho^0\to\pi^0\gamma in respect to \rho^{\pm}\to\pi^{\pm}\gamma. Future precise
measurements will allow to separate different forms of isospin violation and
elucidate their mechanisms.
