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-rw-r--r--ext/tk/lib/tkextlib/bwidget/mainframe.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/bwidget/mainframe.rb b/ext/tk/lib/tkextlib/bwidget/mainframe.rb
index e52f4b2f4c..7f87894586 100644
--- a/ext/tk/lib/tkextlib/bwidget/mainframe.rb
+++ b/ext/tk/lib/tkextlib/bwidget/mainframe.rb
@@ -20,6 +20,11 @@ class Tk::BWidget::MainFrame
WidgetClassName = 'MainFrame'.freeze
WidgetClassNames[WidgetClassName] = self
+ def __tkvariable_optkeys
+ super() << 'progressvar'
+ end
+ private :__tkvariable_optkeys
+
def add_indicator(keys={}, &b)
win = window(tk_send('addindicator', *hash_kv(keys)))
win.instance_eval(&b) if b