  We present a theoretical framework that accounts for the new $D_J$ and
$D_{sJ}$ mesons measured in the open-charm sector. These resonances are
properly described if considered as a mixture of conventional $P-$wave
quark-antiquark states and four-quark components. The narrowest states are
basically $P-$wave quark-antiquark mesons, while the dominantly four-quark
states are shifted above the corresponding two-meson threshold. We study the
electromagnetic decay widths as basic tools to scrutiny their nature.
