dev left menu (channel videolist by "/v3/search?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev left menu (channel playlist by "/v3/playlist?").
dev Video Detail panel.
fix performance with cellSize().
fix performance with cellSize().