design edit settings form

app/UI/Client/Setting/Forms/EditSettingForm.php

@@ -8,10 +8,8 @@ use ThurData\Servers\KerioEmail\Core\UI\Interfaces\ClientArea;
 use ThurData\Servers\KerioEmail\Core\UI\Widget\Forms\Fields\Hidden;
 use ThurData\Servers\KerioEmail\Core\UI\Widget\Forms\Fields\Text;
 use ThurData\Servers\KerioEmail\Core\UI\Widget\Forms\BaseForm;
-use ThurData\Servers\KerioEmail\Core\UI\Widget\Forms\Sections\InputGroup;
-use ThurData\Servers\KerioEmail\Core\UI\Widget\Forms\Fields\InputGroupElements;
 use ThurData\Servers\KerioEmail\Core\UI\Widget\Forms\FormConstants;
-
+use ThurData\Servers\KerioEmail\Core\UI\Widget\Buttons\ButtonCustomAction;
 use function ThurData\Servers\KerioEmail\Core\Helper\di;
 
 /**
@@ -102,6 +100,8 @@ class EditSettingForm extends BaseForm implements ClientArea
         $field->setName('editdkim');
         $this->addField($field);
 
+        $button = new ButtonCustomAction('setDefaults');
+        $this->addButton($button);
         //  todo: additional section containing Kerio Domain settings like AD integration
 //        $this->addSection(new EditGeneralSection());
 //        $this->addSection(new EditAdditionalSection());