Only one Mediator Instead of One for every single Thumbnail!!!

Hi All... i have an issue...
...i lost all my flex projects in my stolen laptop, so i've stated to do all my projects from zero, the problem is that some code that i used to use, now doesn't work....that is weird.

The issue is : in a panel Component Mediator ( WetsuitViewMediator.as) wich has a component associated (WetsuitView.mxml)... i have the following code that create thumbnails from another component (TemplatePiezaItem.mxml)

            var n:int = (_templateProxy.templates[0] as TemplateVO).Piezas.length;
            viewInstance.entidadItems = new Array(n);
            
            for (i=0; i < n; i++)
            {
                var componentItem : TemplatePiezaItem = new TemplatePiezaItem();
                viewInstance.entidadItems[i] = componentItem;
                viewInstance.entidadItems[i].showInAutomationHierarchy = true;
                componentItem._templatePiezaVO = (_templateProxy.templates[0] as TemplateVO).Piezas.getItemAt(i) as TemplatePiezaVO;
                componentItem.source = componentItem._templatePiezaVO.ImagePath;
                viewInstance.entidadContent.addChild(componentItem);
                //piezaItem.piezaColor.setStyle( "backgroundColor", piezaItem.wetsuitPiezaVO.codigoHexa );
                
		var mediator : TemplatePiezaItemMediator = new TemplatePiezaItemMediator( componentItem );
                facade.registerMediator( mediator  );
            }

with above code i have thumbnails of TemplatePiezaItem .mxml in WetsuitView.mxml.

THE PROBLEM is that instead of every single TemplatePiezaItem component has its own TemplatePiezaItemMediator...i only have ONE TemplatePiezaItemMediator for all of them.

i don't understand that's wrong...it worked fine to me before.

Thanks in advance.