Subclassing in Ruby

Hello, everyone.
I’m new to this list.

I’m trying to implement some custom TreeModels and CellRenderers
and having problems.
I find messages(such as “cellrenderer question” thread in 2004) in this
list,
which say it’s impossible to subclass GTK classes in Ruby because
Ruby/GNOME2
only wraps them.

Is this still case today?
Is anyone working on this issue?

Thanks,

=======================================
Takanori Nakane