diff --git a/modules/backend/widgets/Filter.php b/modules/backend/widgets/Filter.php
index c33dea08d..00439d605 100644
--- a/modules/backend/widgets/Filter.php
+++ b/modules/backend/widgets/Filter.php
@@ -15,6 +15,25 @@ use ApplicationException;
  */
 class Filter extends WidgetBase
 {
+    //
+    // Configurable properties
+    //
+
+    /**
+     * @var array Scope definition configuration.
+     */
+    public $scopes;
+
+    /**
+     * @var string The context of this filter, scopes that do not belong
+     * to this context will not be shown.
+     */
+    protected $context = null;
+
+    //
+    // Object properties
+    //
+
     /**
      * {@inheritDoc}
      */
@@ -35,12 +54,6 @@ class Filter extends WidgetBase
      */
     protected $scopeModels = [];
 
-    /**
-     * @var string The context of this filter, scopes that do not belong
-     * to this context will not be shown.
-     */
-    protected $activeContext = null;
-
     /**
      * @var array List of CSS classes to apply to the filter container element
      */
@@ -51,7 +64,10 @@ class Filter extends WidgetBase
      */
     public function init()
     {
-        $this->activeContext = $this->getConfig('context');
+        $this->fillFromConfig([
+            'scopes',
+            'context',
+        ]);
     }
 
     /**
@@ -241,11 +257,11 @@ class Filter extends WidgetBase
         /*
          * All scopes
          */
-        if (!isset($this->config->scopes) || !is_array($this->config->scopes)) {
-            $this->config->scopes = [];
+        if (!isset($this->scopes) || !is_array($this->scopes)) {
+            $this->scopes = [];
         }
 
-        $this->addScopes($this->config->scopes);
+        $this->addScopes($this->scopes);
 
         /*
          * Extensibility
@@ -442,10 +458,11 @@ class Filter extends WidgetBase
 
     /**
      * Returns the active context for displaying the filter.
+     * @return string
      */
     public function getContext()
     {
-        return $this->activeContext;
+        return $this->context;
     }
 
     //