Client-side Events Overview
RadXmlHttpPanel offers a set of client-side events that let the developer apply the needed logic through the control's Client-side API:
OnClientResponseEnding—occurs before the data (content) is pasted into the RadXmlHttpPanel.
OnClientResponseEnded—occurs immediately after the data (content) is pasted into the RadXmlHttpPanel.
OnClientResponseError—occurs in the cases when an error (WebService or Callback error) occurs when the RadXmlHttpPanel tries to load certain content.