AS3 Custom Depth Control

Question

I am trying to create a way of controlling movieclip depths, which movieclip is show above another, so that I can set the depth of a movieclip to any number and they will be displayed with higher values above lower values.

I was thinking of creating a MovieClipDepth class that extends MovieClip with the added property depth, and a Container class that extends DisplayObjectContainer which all objects will be placed inside of.

The Container class will override the addChild method to update the child display order when a child is added.

What I need help with is how do I reorder the children according to their depth value?