item renderers memory leak in spark.list

[Gabriele Campi]

Hi,
I'm facing with a memory leak while while setting new dataprovider for a 
spark list.
The list is using a virtual layout but never destroys previous (custom) 
item renderers (extending LabelItemRenderer) when creates the new ones, 
so they remain stored in memory.

Any ideas?

Thanks

Gabri

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