code: def add_controls(self, controls):
      self.layer_controls = list(self.layer_controls) + [controls]
  
imports: import ipywidgets
  from traitlets import Unicode, List
  from .maps import GMapsWidgetMixin
label_desc: Use image node_id 1 for calling the Toolbar obj's underlying member method code with example usage: obj.add_controls(controls) without return types