[flexcoders] How can I create an event that calls a function?

[sailorsea21]

Hi everyone, 
How can I create an event that calls a function once an ArrayCollection is 
filled?

This is what I'm using at the moment but I would like to avoid setTimeout:

public function checkArrayCollection():void
{
        if(myArrayCollection)
        {

        }
        else
        {
                setTimeout(checkArrayCollection, 200);
        }                                               
}