I've been trying to update a RadGrid (with ajax) that is inside of a Tab (The RadTab has 3 tabs), the object that fires the update is a RadComboBox (with the SelectedIndexChanged method) inside of another Tab, but I can't. Some tips please. Thanks.
Try placing the entire Tabstrip inside a RadAjaxPanel or use RadAjaxManager where you can set the AjaxControlID as button and AjaxUpdatedControl - ControlID as RadGrid.