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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb
index a60059f744..c933bf2985 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb
@@ -19,6 +19,11 @@ class Tk::Iwidgets::Scrolledlistbox
WidgetClassName = 'Scrolledlistbox'.freeze
WidgetClassNames[WidgetClassName] = self
+ def __tkvariable_optkeys
+ super() << 'listvariable'
+ end
+ private :__tkvariable_optkeys
+
################################
def initialize(*args)