Mithril change data in other components

example.js

var a = {
  controller : function(){
    var ctrl = this;
    ctrl.data = m.prop(true);
    ctrl.getData = function(){
      ctrl.data = m.prop(!ctrl.data());
    }
  },
  view: function(ctrl){
    return m('div', [
      m.component(b, {data: ctrl.data}),
      m.component(c, {action: ctrl.getData})
    ])
  }
}

var b = {
  view: function(ctrl, args){
    return m('h1', args.data())
  }
}

var c = {
  view: function(ctrl, args){
    return m('a.btn', {onclick: args.action}, 'change')
  }
}

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