Can I extends a sub class of Proxy class?

I want to create a complete (and real) 2-dimensional array.

In order to use a maximum of Adobe code, I want to use ListCollectionView which can manage sort and filters. But to use a second dimension, I need to override getProperty method, like following code.

package { import flash.utils.flash_proxy; import mx.collections.ListCollectionView;

public class SubClass extends ListCollectionView /* extends Proxy */
{
    override flash_proxy function getProperty(name : *) : *
    {
        ...
    }
    override flash_proxy function setProperty(name : *, value : 开发者_如何学Go*) : void
    {
        ...
    }

}

}

This code doesn't work. Flash Builder 4 said to me:

1004      Namespace was not found or is not a compile-time constant.

If anyone has a solution or a clue...

It's easy :

use namespace flash_proxy;