  We present a novel dynamics for generating sizable CP-violating asymmetries
in the decays of charged $B^\mp\to \pi^\mp \omega, \pi^\mp\rho^0,
\pi^0\rho^\mp$, and in $\bar{B^0}(B^0)\to\pi^\mp\rho^\pm$. The dynamics for the
necessary final-state interactions involves the mixing of G-parity eigenstates
of the system $(\bar{D}^*D,D^*\ol{D})$ with the $G=\pm 1$ states of $\pi\omega$
and $\pi\rho$, respectively. The dynamical effect is enhanced by the
empirically large branching ratio for decays to $(\bar{D}^*D,D^*\bar{D})$. A
correlated result is a markedly enhanced branching ratio for
$\bar{B^0}(B^0)\to\pi^0\rho^0$, which has now been observed in two experiments.
