Model.get('toolbar') always return null

The extendFn was added from https://github.com/artf/grapesjs/releases/tag/v0.14.61 in the demo you're using the 0.14.57

I am so sorry, it's my mistake. Thanks for your guidance

Yes, if you override the original initToolbar method the toolbar property is never created, so you have to call the parent one first. Try with this component creation helper

extendFn: ['initToolbar'], // array of model functions to extend
model: {
  // ...
  initToolbar () {