Extended MovieClip scope issues

I have the following build of a nested MovieClip.

mBreadcrumbs{ mHost{ mIconImg, mIconText } }

mHost is attached to an extended MovieClip class. Within the class itself when I test some trace results I get the following…

this.name = mHost (correct)
this.parent.name = mBreadcrumbs (correct)
this.mIconImg.name = null (out of scope?)

So my question is: How come the movieClip within the classed MovieClip seems out of scope? and How can I access that movieClip (preferably relative from the classed MovieClip and not from the stage).

Thanks in advance!