 by the View when the Mediator is registered.<br />Registers <a class="privatInline" href="balloonatroid_view_BossSpriteMediator.html#enterFrameHandler">enterFrameHandler</a> method as an <code>EnterFrame</code> event handler to the sprite. </div><div class="boxWithBorder"><div class="boxedElem"><div class="contentHolder"><span class="title">Usage:</span><div class="item"><ul><li> Expects <code>BossProxy</code> and <code>GameProxy</code> to be registered previously. </li></ul></div></div></div></div></div><