diff --git a/modules/backend/classes/WidgetBase.php b/modules/backend/classes/WidgetBase.php
index 66367f477..1f098e8f3 100644
--- a/modules/backend/classes/WidgetBase.php
+++ b/modules/backend/classes/WidgetBase.php
@@ -29,16 +29,16 @@ abstract class WidgetBase
      */
     protected $controller;
 
-    /**
-     * @var string A unique alias to identify this widget.
-     */
-    public $defaultAlias = 'widget';
-
     /**
      * @var string Defined alias used for this widget.
      */
     public $alias;
 
+    /**
+     * @var string A unique alias to identify this widget.
+     */
+    protected $defaultAlias = 'widget';
+
     /**
      * Constructor
      * @param Backend\Classes\Controller $controller
@@ -80,26 +80,6 @@ abstract class WidgetBase
         }
     }
 
-    /**
-     * Transfers config values stored inside the $config property directly
-     * on to the root object properties. If no properties are defined
-     * all config will be transferred if finds a match.
-     * @param array $properties
-     * @return void
-     */
-    protected function fillFromConfig($properties = null)
-    {
-        if ($properties === null) {
-            $properties = array_keys((array) $this->config);
-        }
-
-        foreach ($properties as $property) {
-            if (property_exists($this, $property)) {
-                $this->{$property} = $this->getConfig($property, $this->{$property});
-            }
-        }
-    }
-
     /**
      * Initialize the widget, called by the constructor and free from its parameters.
      * @return void
@@ -138,6 +118,26 @@ abstract class WidgetBase
         $this->controller->widget->{$this->alias} = $this;
     }
 
+    /**
+     * Transfers config values stored inside the $config property directly
+     * on to the root object properties. If no properties are defined
+     * all config will be transferred if it finds a matching property.
+     * @param array $properties
+     * @return void
+     */
+    protected function fillFromConfig($properties = null)
+    {
+        if ($properties === null) {
+            $properties = array_keys((array) $this->config);
+        }
+
+        foreach ($properties as $property) {
+            if (property_exists($this, $property)) {
+                $this->{$property} = $this->getConfig($property, $this->{$property});
+            }
+        }
+    }
+
     /**
      * Returns a unique ID for this widget. Useful in creating HTML markup.
      * @param string $suffix An extra string to append to the ID.
diff --git a/modules/backend/formwidgets/CodeEditor.php b/modules/backend/formwidgets/CodeEditor.php
index ded2567c0..7dd83d759 100644
--- a/modules/backend/formwidgets/CodeEditor.php
+++ b/modules/backend/formwidgets/CodeEditor.php
@@ -15,7 +15,7 @@ class CodeEditor extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'codeeditor';
+    protected $defaultAlias = 'codeeditor';
 
     /**
      * @var string Code language to display (php, twig)
diff --git a/modules/backend/formwidgets/ColorPicker.php b/modules/backend/formwidgets/ColorPicker.php
index 6aeef0682..67c33c7e5 100644
--- a/modules/backend/formwidgets/ColorPicker.php
+++ b/modules/backend/formwidgets/ColorPicker.php
@@ -14,7 +14,7 @@ class ColorPicker extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'colorpicker';
+    protected $defaultAlias = 'colorpicker';
 
     /**
      * @var array Default available colors
diff --git a/modules/backend/formwidgets/DataGrid.php b/modules/backend/formwidgets/DataGrid.php
index 17ff471f8..c04a09a70 100644
--- a/modules/backend/formwidgets/DataGrid.php
+++ b/modules/backend/formwidgets/DataGrid.php
@@ -16,7 +16,7 @@ class DataGrid extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'datagrid';
+    protected $defaultAlias = 'datagrid';
 
     /**
      * @var string Grid size
diff --git a/modules/backend/formwidgets/DataTable.php b/modules/backend/formwidgets/DataTable.php
index 3f1d52d19..b401d9a05 100644
--- a/modules/backend/formwidgets/DataTable.php
+++ b/modules/backend/formwidgets/DataTable.php
@@ -17,7 +17,7 @@ class DataTable extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'datatable';
+    protected $defaultAlias = 'datatable';
 
     /**
      * @var string Table size
diff --git a/modules/backend/formwidgets/DatePicker.php b/modules/backend/formwidgets/DatePicker.php
index 0c1fabf42..18a4705ee 100644
--- a/modules/backend/formwidgets/DatePicker.php
+++ b/modules/backend/formwidgets/DatePicker.php
@@ -16,7 +16,7 @@ class DatePicker extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'datepicker';
+    protected $defaultAlias = 'datepicker';
 
     /**
      * @var bool Display mode: datetime, date, time.
diff --git a/modules/backend/formwidgets/FileUpload.php b/modules/backend/formwidgets/FileUpload.php
index e1f56fa13..16ee7eddf 100644
--- a/modules/backend/formwidgets/FileUpload.php
+++ b/modules/backend/formwidgets/FileUpload.php
@@ -27,7 +27,7 @@ class FileUpload extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'fileupload';
+    protected $defaultAlias = 'fileupload';
 
     /**
      * @var int Preview image width
diff --git a/modules/backend/formwidgets/RecordFinder.php b/modules/backend/formwidgets/RecordFinder.php
index 1f347a8d3..b91bd419b 100644
--- a/modules/backend/formwidgets/RecordFinder.php
+++ b/modules/backend/formwidgets/RecordFinder.php
@@ -24,7 +24,7 @@ class RecordFinder extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'recordfinder';
+    protected $defaultAlias = 'recordfinder';
 
     /**
      * @var string Relationship type
diff --git a/modules/backend/formwidgets/Relation.php b/modules/backend/formwidgets/Relation.php
index 9eadcce68..a48785734 100644
--- a/modules/backend/formwidgets/Relation.php
+++ b/modules/backend/formwidgets/Relation.php
@@ -17,7 +17,7 @@ class Relation extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'relation';
+    protected $defaultAlias = 'relation';
 
     /**
      * @var string Relationship type
diff --git a/modules/backend/formwidgets/RichEditor.php b/modules/backend/formwidgets/RichEditor.php
index c2c2dab9a..07d8de7e6 100644
--- a/modules/backend/formwidgets/RichEditor.php
+++ b/modules/backend/formwidgets/RichEditor.php
@@ -14,7 +14,7 @@ class RichEditor extends FormWidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'richeditor';
+    protected $defaultAlias = 'richeditor';
 
     /**
      * @var boolean Determines whether content has HEAD and HTML tags.
diff --git a/modules/backend/widgets/Filter.php b/modules/backend/widgets/Filter.php
index 5b3d55ca6..c33dea08d 100644
--- a/modules/backend/widgets/Filter.php
+++ b/modules/backend/widgets/Filter.php
@@ -18,7 +18,7 @@ class Filter extends WidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'filter';
+    protected $defaultAlias = 'filter';
 
     /**
      * @var boolean Determines if scope definitions have been created.
diff --git a/modules/backend/widgets/Form.php b/modules/backend/widgets/Form.php
index 613c25e55..62c144895 100644
--- a/modules/backend/widgets/Form.php
+++ b/modules/backend/widgets/Form.php
@@ -43,7 +43,7 @@ class Form extends WidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'form';
+    protected $defaultAlias = 'form';
 
     /**
      * @var Model Form model object.
diff --git a/modules/backend/widgets/Grid.php b/modules/backend/widgets/Grid.php
index 4e42fd664..cb0a1bb40 100644
--- a/modules/backend/widgets/Grid.php
+++ b/modules/backend/widgets/Grid.php
@@ -23,7 +23,7 @@ class Grid extends WidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'grid';
+    protected $defaultAlias = 'grid';
 
     /**
      * @var array Grid columns
diff --git a/modules/backend/widgets/ReportContainer.php b/modules/backend/widgets/ReportContainer.php
index 5010e45d8..01a63c0d0 100644
--- a/modules/backend/widgets/ReportContainer.php
+++ b/modules/backend/widgets/ReportContainer.php
@@ -55,6 +55,11 @@ class ReportContainer extends WidgetBase
     // Object properties
     //
 
+    /**
+     * {@inheritDoc}
+     */
+    protected $defaultAlias = 'reportContainer';
+
     /**
      * @var array Collection of all report widgets used by this container.
      */
@@ -65,11 +70,6 @@ class ReportContainer extends WidgetBase
      */
     protected $reportsDefined = false;
 
-    /**
-     * {@inheritDoc}
-     */
-    public $defaultAlias = 'reportContainer';
-
     /**
      * Constructor.
      */
diff --git a/modules/backend/widgets/Search.php b/modules/backend/widgets/Search.php
index df0f65a5b..c8b11b231 100644
--- a/modules/backend/widgets/Search.php
+++ b/modules/backend/widgets/Search.php
@@ -15,7 +15,7 @@ class Search extends WidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'search';
+    protected $defaultAlias = 'search';
 
     /**
      * @var string Search placeholder text.
diff --git a/modules/backend/widgets/Table.php b/modules/backend/widgets/Table.php
index f203c52c0..5688fb40f 100644
--- a/modules/backend/widgets/Table.php
+++ b/modules/backend/widgets/Table.php
@@ -18,7 +18,7 @@ class Table extends WidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'table';
+    protected $defaultAlias = 'table';
 
     /**
      * @var array Table columns
diff --git a/modules/backend/widgets/Toolbar.php b/modules/backend/widgets/Toolbar.php
index 5e235fa97..5ae3f5642 100644
--- a/modules/backend/widgets/Toolbar.php
+++ b/modules/backend/widgets/Toolbar.php
@@ -14,7 +14,7 @@ class Toolbar extends WidgetBase
     /**
      * {@inheritDoc}
      */
-    public $defaultAlias = 'toolbar';
+    protected $defaultAlias = 'toolbar';
 
     /**
      * @var WidgetBase Reference to the search widget object.