I can suggest that you try one of the following approaches:
- Display a modal RadNotification when the button which makes the request to server is clicked and then hide the RadNotificaion when the request is executed(e.g. using sys.application.add_load() event). You may find useful the following resource in achieving this scenario:
- Use the RadAjaxLoadingPanel and make the page modal on displaying the loading panel or when an Ajax Request starts. Such an example is illustrated in "gray out" page when displaying loading panel Code Library. Note that the code library has been create a long time ago, so that some modifications must be made (i.e. change the RadControls tag prefixes from radA to telerik).
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