Ext.ContentPanel - create inactive

How to create new iactive contetn panel ?
After i add to region new ContentPanel - it make active and load content. I whant create all panels and than load contat on activate panel.

Not documented feateru -

Code:

---

              this.editPanel.add('center', new Ext.ContentPanel('productCard_' + dataCard.tabs[i].name,{
                  title : dataCard.tabs[i].title,
                  autoCreate: true,
                  closable : false,
                  url: dataCard.tabs[i].url,
                  loadOnce: true,
                  background: true
              }));

---

Use background to load panel in backgrond mode =).