Add custom button in ckeditor plugin grapesjs

[JoanCodinachUoc]

I use the pluginOptions of the ckeditor plugin in grapesjs to include the buttons that i want and works fine. Now i want a button in ckeditor that open my angular modal, like i did with rich text editor.

this.editor.RichTextEditor.add('variables', { icon: '..', result : 'here i open my pop up}

How can i add a button in ckeditor toolbar that can open my angular pop up ?

[artf]

You have to figure that out from the CKEditor's API

[JoanCodinachUoc]

I know that the plugin you can pass the ckeditor as a option and this will have my new toolbar, but how i get this ckeditor object ?