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-rw-r--r--ext/tk/lib/tkextlib/blt/graph.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/tk/lib/tkextlib/blt/graph.rb b/ext/tk/lib/tkextlib/blt/graph.rb
index e9fbdd587..9ae99bff5 100644
--- a/ext/tk/lib/tkextlib/blt/graph.rb
+++ b/ext/tk/lib/tkextlib/blt/graph.rb
@@ -22,7 +22,7 @@ module Tk::BLT
private :__boolval_optkeys
def __strval_optkeys
- ['text', 'label', 'title', 'file']
+ ['text', 'label', 'title', 'file', 'plotbackground']
end
private :__strval_optkeys