diff --git a/traitsui/editors/array_editor.py b/traitsui/editors/array_editor.py
index e1f12a854..bb9f6235d 100644
--- a/traitsui/editors/array_editor.py
+++ b/traitsui/editors/array_editor.py
@@ -55,8 +55,7 @@ class ArrayStructure(HasTraits):
     def __init__(self, editor):
         """ Initializes the object.
         """
-        # Save the reference to the editor:
-        self.editor = editor
+        super().__init__(editor=editor)
 
         # Set up the field width for each item:
         width = editor.factory.width
diff --git a/traitsui/editors/tuple_editor.py b/traitsui/editors/tuple_editor.py
index 862ce95ac..a07d2d86a 100644
--- a/traitsui/editors/tuple_editor.py
+++ b/traitsui/editors/tuple_editor.py
@@ -113,15 +113,14 @@ class TupleStructure(HasTraits):
     def __init__(self, editor):
         """ Initializes the object.
         """
+        super().__init__(editor=editor)
+
         factory = editor.factory
         types = factory.types
         labels = factory.labels
         editors = factory.editors
         cols = factory.cols
 
-        # Save the reference to the editor:
-        self.editor = editor
-
         # Get the tuple we are mirroring:
         object = editor.value
 
diff --git a/traitsui/qt4/ui_panel.py b/traitsui/qt4/ui_panel.py
index f49203979..011f05ab2 100644
--- a/traitsui/qt4/ui_panel.py
+++ b/traitsui/qt4/ui_panel.py
@@ -102,7 +102,8 @@ class _Panel(BasePanel):
     def __init__(self, ui, parent, is_subpanel):
         """Initialise the object.
         """
-        self.ui = ui
+        super().__init__(ui=ui)
+
         history = ui.history
         view = ui.view