[flexcoders] Adding objects to arraycollections

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Hello all, I was wondering how to add objects to arraycollections
arrycoll:ArrayCollection = new ArrayCollection();
obj1:Object = new Object();
obj2:Object = new Object();

obj1.id = 'Hi';
obj.2.id = 'Bye';

how do I add obj1 and obj2 to an array collection?
 
Thanks,
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