New class syntax.
diff --git a/Lib/lib-stdwin/Histogram.py b/Lib/lib-stdwin/Histogram.py
index 505bbaf..27ae673 100644
--- a/Lib/lib-stdwin/Histogram.py
+++ b/Lib/lib-stdwin/Histogram.py
@@ -4,7 +4,7 @@
# A Histogram displays a histogram of numeric data.
#
-class HistogramAppearance() = LabelAppearance(), Define():
+class HistogramAppearance(LabelAppearance, Define):
#
def define(self, parent):
Define.define(self, (parent, ''))
@@ -33,4 +33,4 @@
d.paint((h0, v0), (h1, v1))
#
-class Histogram() = NoReactivity(), HistogramAppearance(): pass
+class Histogram(NoReactivity, HistogramAppearance): pass