I am adding it at run time for both TextBox and a label, following way in panel bar's ItemCreated event.
Private
Sub pnlBarAccounts_ItemCreated(ByVal sender As Object, ByVal e As Telerik.Web.UI.RadPanelBarEventArgs) Handles pnlBarAccounts.ItemCreated
RadAjaxManagerProxyAcctSetup.AjaxSettings.AddAjaxSetting(RadAjaxManagerProxyAcctSetup, txtFIName)
RadAjaxManagerProxyAcctSetup.AjaxSettings.AddAjaxSetting(RadAjaxManagerProxyAcctSetup, lblFiNameText)
And try to update in following event Text for both these controls. Text box get's udpated but not label. I am assigning same text for both controls
Private
Sub Manager_AjaxRequest(ByVal sender As Object, ByVal e As Telerik.Web.UI.AjaxRequestEventArgs)