'#type' => 'button',
'#attributes' => ['class' => ['tab']],
'#value' => $label,
'#disabled' => $id == $this->getDefaultWidget(),
'#executes_submit_callback' => TRUE,
'#type' => 'button',
'#attributes' => ['class' => ['tab']],
'#value' => $label,
'#disabled' => $id == $this->getDefaultWidget(),
'#executes_submit_callback' => TRUE,