BUG: Button trait command doesn't work

Version: Latest

Describe the bug detailed

https://jsfiddle.net/cleaver/wgz2jsvq/2/ Nothing happens on:

        traits: [
          {
            text: 'Simple button',
            type: 'button',
            full: true,
            command: () => {
              console.log('Broken button');
              alert('Broken button');
            },
          },
        ]

---

On version 0.16.45 the same code worked fine: https://jsfiddle.net/cleaver/kenvpt50/1/