I have an item in my Treeview that I want to highlight. I have this
code:

  require 'tk'

  tree = Tk::Tile::Treeview.new.pack

  tree.insert('', 'end', :text => 'blah blah', :tags => ['important'])

  tree.tag_configure('configure', 'important', :background => 'yellow')

  Tk.mainloop

But the item isn't shown with its background painted in yellow.

I took that code from:

  http://www.tkdocs.com/tutorial/tree.html#appearance

That article mentions this bug in Ruby/Tk.

Is it possible to add some code in Ruby to fix the bug?

(I'm using Tk 8.4, Tile, and Ruby 1.8.7p174, Ubuntu.)
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