Can anyone tell me if the TkListbox option
insertBackground is available in Ruby Tk?

I'm having no luck when trying to set this option via
the TkListbox.configure('insertBackground', 'red')
method or even trying to set this option through the
TkListbox.new constructor.

What I'm trying to do is change the background color
of a particular Listbox item.

Thanks in advance,

Jason T

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