diff --git a/core/Crud/Field/ButtonField.php b/core/Crud/Field/ButtonField.php
index 65e986e..fcd4961 100644
--- a/core/Crud/Field/ButtonField.php
+++ b/core/Crud/Field/ButtonField.php
@@ -3,6 +3,7 @@
 namespace App\Core\Crud\Field;
 
 use Symfony\Component\OptionsResolver\OptionsResolver;
+use Twig\Environment;
 
 /**
  * class ButtonField.
@@ -11,6 +12,15 @@ use Symfony\Component\OptionsResolver\OptionsResolver;
  */
 class ButtonField extends Field
 {
+    public function buildView(Environment $twig, $entity, array $options, ?string $locale = null)
+    {
+        if (isset($options['button_attr_builder']) && is_callable($options['button_attr_builder'])) {
+            $options['button_attr'] = (array) call_user_func($options['button_attr_builder'], $entity, $options);
+        }
+
+        return parent::buildView($twig, $entity, $options, $locale);
+    }
+
     public function configureOptions(OptionsResolver $resolver): OptionsResolver
     {
         parent::configureOptions($resolver);
@@ -18,11 +28,13 @@ class ButtonField extends Field
         $resolver->setDefaults([
             'view' => '@Core/admin/crud/field/button.html.twig',
             'button_attr' => [],
+            'button_attr_builder' => null,
             'button_tag' => 'button',
         ]);
 
         $resolver->setAllowedTypes('button_attr', ['array']);
         $resolver->setAllowedTypes('button_tag', ['string']);
+        $resolver->setAllowedTypes('button_attr_builder', ['null', 'callable']);
 
         return $resolver;
     }
diff --git a/core/Form/Type/CollectionType.php b/core/Form/Type/CollectionType.php
new file mode 100644
index 0000000..166d5d5
--- /dev/null
+++ b/core/Form/Type/CollectionType.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Core\Form\Type;
+
+use Symfony\Component\Form\Extension\Core\Type\CollectionType as BaseCollectionType;
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\Form\FormView;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+class CollectionType extends BaseCollectionType
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function buildView(FormView $view, FormInterface $form, array $options)
+    {
+        parent::buildView($view, $form, $options);
+
+        $view->vars = array_replace($view->vars, [
+            'collection_name' => $options['collection_name'],
+            'label_add' => $options['label_add'],
+            'label_delete' => $options['label_delete'],
+        ]);
+    }
+
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        parent::configureOptions($resolver);
+
+        $resolver->setDefaults([
+            'collection_name' => '',
+            'label_add' => 'Add',
+            'label_delete' => 'Delete',
+        ]);
+    }
+
+    public function getBlockPrefix()
+    {
+        return 'murph_collection';
+    }
+}
diff --git a/core/Resources/views/form/bootstrap_4_form_theme.html.twig b/core/Resources/views/form/bootstrap_4_form_theme.html.twig
index 7228c94..419f399 100644
--- a/core/Resources/views/form/bootstrap_4_form_theme.html.twig
+++ b/core/Resources/views/form/bootstrap_4_form_theme.html.twig
@@ -74,3 +74,41 @@
         </div>
     </template>
 {% endblock %}
+
+{% block murph_collection_widget %}
+    <div data-collection="collection-{{ collection_name }}">
+        {% for item in form %}
+            <div data-collection-item="{{ loop.index }}" class="mb-1">
+                {% for child in item %}
+                    {{ form_row(child) }}
+                {% endfor %}
+
+                <div class="text-right">
+                    <span data-collection-delete-container class="btn btn-sm btn-danger">
+                        <span data-collection-delete="{{ loop.index }}">
+                            {{ label_delete|trans }}
+                        </span>
+                    </span>
+                </div>
+            </div>
+        {% endfor %}
+    </div>
+
+    <div data-collection-add="collection-{{ collection_name }}" class="collection-add">
+        <span class="btn btn-sm btn-primary" data-collection-add="collection-{{ collection_name }}">
+            {{ label_add|trans }}
+        </span>
+    </div>
+
+    <template type="text/template" id="collection-{{ collection_name }}">
+        <div data-collection-item="__name__">
+            {{ form_rest(form.vars.prototype) }}
+
+            <div class="text-right">
+                <span data-collection-delete-container class="btn btn-sm btn-danger">
+                    {{ label_delete|trans }}
+                </span>
+            </div>
+        </div>
+    </template>
+{% endblock %}