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-rw-r--r--ext/tk/lib/tkextlib/bwidget/dynamichelp.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/bwidget/dynamichelp.rb b/ext/tk/lib/tkextlib/bwidget/dynamichelp.rb
index 4766a1ec6d..224304f2ab 100644
--- a/ext/tk/lib/tkextlib/bwidget/dynamichelp.rb
+++ b/ext/tk/lib/tkextlib/bwidget/dynamichelp.rb
@@ -21,6 +21,11 @@ module Tk::BWidget::DynamicHelp
'DynamicHelp::configure'
end
+ def __strval_optkeys
+ super() << 'topbackground'
+ end
+ private :__strval_optkeys
+
def self.__cget_cmd
['DynamicHelp::configure']
end