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On columns.yaml I have a button: 
```
button:
        label: SetContent
        type: partial
        clickable: false
        path: $/acme/test/models/testmodel/_button.htm
```
On _button.htm : 
```
<button
    class="btn btn-danger oc-icon-file-text-o"          
    data-request="onContentModal"
    data-toggle="modal"
    href="#content-modal"
    data-request-update="partials/popup_content_form: '#contentModal'"          
    data-stripe-load-indicator
>
Set Content
</button>
```
to show modal after clicking on button add this lines on index.hym on controller :
```

<?= $this->listRender() ?>
 
 <div
 class="modal fade"
 id="content-modal"
 tabindex="-1"
 aria-labelledby="cartModalLabel"
 aria-hidden="true"

>
     <div class="modal-dialog modal-lg">
         <div class="modal-content" id="contentModal">
             <div class="modal-header  text-center">
                <h5 class="modal-title" >Rich Text Editor on Modal </h5>              
             </div>
             <div class="modal-body" id="cartinfo">
                  Please wait . . . 
             </div>
             <div class="modal-footer"></div>
         </div>
     </div>
 </div>

```
add this method on controller:
```
public function onContentModal()
    {
        $config = $this->makeConfig('$/acme/test/models/testmodel/fields_content.yaml');

$config->model = new \Acme\Test\Models\TestModel;
        $widget = $this->makeWidget('Backend\Widgets\Form', $config);

$this->vars['widget'] = $widget;
    }
```

<?= $widget->render() ?>

</div>        
    <div class="modal-footer">
        <button data-request="onUpdate" class="btn btn-primary">
            OK
        </button> 
    </div>
    <?= Form::close() ?>
```

[sample codes are here(github)](https://github.com/rezalaal/wn-test-richeditor)
 
 Thanks from : 
 Romain 'Maz' B.  and LukeTowers

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Backend Plugin Development CMS Twig Themes Deployment