ActionScript 3.0 :: Finding NumChildren On Main Timeline?

Oct 15, 2009

I am trying to find number of children, from a class, on the main timeline as below:

Code:
var num: uint = this.root.numChildren;

But, the comiler makes faces and reports as;"Access of possibly undefined property numChildren through a reference with static type flash.display: DisplayObject." I also request to shed some light on static type flash.display - what does this mean!

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