Why is RadAjaxManager doing full PostBacks?

[john81]

This page (http://www.telerik.com/help/aspnet-ajax/manager-vs-panel.html) states that you should use RadAjaxManager or RadAjaxPanel and recommends the RadAjaxManger for more complex scenarios.  I'm attempting to use the RadAjaxManager on a page that where I want the top RadComboxBox selection to affect which controls below it are visible or hidden.  It works but full postbacks are occuring on the page.  Why is that?  If I wrap the controls with RadAjaxPanels then the full postbacks go way and the AJAX works.  I thought you did not need to use RadAjaxPanel with the RadAjaxManger.  Am I okay using RadAjaxManger with RadAjaxPanel in this scenario?

[robertw102]

Are you including the controls that it updates in the UpdatedControls collection for the RadComboBox ajax setting?