Hi Jorge,
Thanks for the update.
As mentioned earlier, content has been loaded from the given url by using Url property in the tab control. The tab content loaded from a url can be reloaded programmatically by using the javascript Ajax function and Tab ClientsideOnActive event. First, we got the Active index value through OnActive event, and then by button click event, the url value has been updated to the Tab contents, and thus the value of the particular tabitem is reloaded.
Please find the attached sample,
http://www.syncfusion.com/downloads/support/forum/121220/ze/TabSample1-448471572
Please let us know if you have further queries.
Regards,
Arun P