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-rw-r--r--ext/tk/lib/tk/image.rb5
1 files changed, 5 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/image.rb b/ext/tk/lib/tk/image.rb
index e3880106a..35e2c4e39 100644
--- a/ext/tk/lib/tk/image.rb
+++ b/ext/tk/lib/tk/image.rb
@@ -96,6 +96,11 @@ class TkImage<TkObject
end
class TkBitmapImage<TkImage
+ def __strval_optkeys
+ super() + ['maskdata', 'maskfile']
+ end
+ private :__strval_optkeys
+
def initialize(*args)
@type = 'bitmap'
super(*args)