docs: protected void initializePropertyEditor() {
  
          Map<String, CmsXmlContentProperty> propertyConfig = m_values.getPropertyDefinitions();
          m_propertyEditorHandler = new CmsUploadPropertyEditorHandler(m_dialog, m_values);
          CmsSimplePropertyEditor propertyEditor = new CmsUploadPropertyEditor(propertyConfig, m_propertyEditorHandler);
          propertyEditor.getForm().setFormHandler(this);
          m_propertyEditor = propertyEditor;
          m_propertyEditor.initializeWidgets(null);
          A_CmsFormFieldPanel propertiesPanel = m_propertyEditor.getForm().getWidget();
          add(propertiesPanel);
      }