http://jsfiddle.net/nkovacs/djq02tkt/

Click "Page 1", wait for the component to appear, then click "Page 2".
Click "Log $children". You should only see [Page2] in the console.

Click "Page 1", then immediately click "Page 2", before page1 loads.
Click "Log $children". You'll see [Page1, Page2] in the console. Page1 is stuck forever in the parent's $children array.