In the documentation I notice the following
Image chart only:shading - on ChartCommander charts myDBR supports 5.0 shading values (LocalGradientShading, GlobalGradientShading, ConcaveShading, RoundedEdgeShading, RadialShading, FlatShading and RingShading). See more info from ChartCommander documentation.
I presume ChartCommander means CharDirector
Thanks
Mark