Hi Cheryl,
Generally there is an option to manually show RadAjaxPanel on a button click event using its client show() method. However unfortunately in case of exporting scenarios there is no server event that firs which could be used to hide the already shown RadAjaxLoadingPanel.
Therefore in such scenarios the appearance of RadAjaxLoadingPanel is not possible.
More information on the RadAjaxLoadingPanel manual showing could be found below:
http://www.telerik.com/help/aspnet-ajax/ajax-show-hide-loadingpanel.html
Regards,
Maria Ilieva
Telerik
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