Hi,
Like in Title how can i do that from code behind? now i got Panel with autoLoad and gived url to page with my control but it gives me errors when i load that page with TabPanel because my control seems to be null. Is there any way to make this control with ajax AutoLoad after i activate Tab?

i got this error "Ext.net.Store is not a constructor" when i load the page with single UserControl which contains gridPanel.