Actions specified inside the {{render}} helper appear not to reach their specified controller.

application.hbs

{{#render "header"}}
  <header class="header-main">
    <!-- 
         * Dropping the debugger here has this.controller properly
           set (<Ab.HeaderController:emberXXX>).

         * this.view is null, although render.js#L57 correctly finds the object named 'view:header'

         * Calling this.controller.toggleMode() from the debugger works as expected.
     -->
    <nav class="nav-main">
      <button {{action toggleMode}}>Grid Mode</button>
    </nav>
  </header>
{{/render}}  
{{outlet}}

header_controller.js.coffee

# This controller doesn't manage a model. 
#
Ab.HeaderController = Ember.Controller.extend
  needs: ['currentUser']
  toggleMode: ->
    @get('controllers.currentUser').toggleProperty 'usesCompactLayout'

header_view.js.coffee

# For debugging purposes, I wanted to see if I could direct the action to the view,
# and then forward it, but this `toggleMode` is also not reached by the action helper.
Ab.HeaderView = Ember.View.extend()
#  toggleMode: -> @get('controller').send('toggleMode', arguments...)

Nevermind I guess?