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-rw-r--r--ext/tk/lib/tk.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/tk/lib/tk.rb b/ext/tk/lib/tk.rb
index f831dbc78a..c933f9db8b 100644
--- a/ext/tk/lib/tk.rb
+++ b/ext/tk/lib/tk.rb
@@ -2131,6 +2131,8 @@ class TkTextWin<TkWindow
end
class TkListbox<TkTextWin
+ include Scrollable
+
WidgetClassNames['Listbox'] = self
def TkListbox.to_eval
'Listbox'