Open modal after drop element

Use Editor events 
[https://grapesjs.com/docs/api/editor.html#available-events](https://grapesjs.com/docs/api/editor.html#available-events)
`editor.on('component:add', (model, argument) => {
        //filter using component name       
        if (model.getName() === 'modelName') {
          //show modal
        }
        //filter using css Class
        if (model.getAttrToHTML().class === 'className') {
          //show model
        }
      });`