>>I want to create an object and need this object keep an array of other objects. How can I do it?
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>>I mean, how to create a behavior similar to that in pageframes, containers, forms or so, that keeps a collection of objects inside a single object? Even more, how could it keep track of the number of elements?
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>Use property-array and ALEN(thisform.amyarray) will return the number of elements. Any time you add/remove new member, you will redimension this array.

Thanks for your help. But it's not clear enough to me how to achieve what I'm looking 4. Would you please give me a more specific help on this?