RadAsyncUpload Controls not visible

[Scott Meyer]

I am trying to use the RadAsyncUpload control. I've added the necessary handlers and module, and I have a RadScriptManager on the page. When I view my user control in design mode, I can clearly see the controls. However, when I try to run my website, the controls don't appear on the page. Any idea why not?

Edit:

It looks like there may be a problem loading WebResource.axd. May handlers in web.config are correct, but I'm loading the control that contains the RadAsyncUpload control dynamically, and through N2CMS. When I look at the javascript error console, I get his error:

Error: illegal character
Source File: http://localhost:63445/Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=ctl00_ctl00_MasterBody_PlaceContentHere_ctl00_ScriptManager_TSM&compress=1&_TSM_CombinedScripts_=%3b%3bSystem.Web.Extensions%2c+Version%3d3.5.0.0%2c+Culture%3dneutral%2c+PublicKeyToken%3d31bf3856ad364e35%3aen-US%3ad0c4ca6e-6b5d-49b6-922d-5244924fb100%3aea597d4b%3ab25378d2%3bTelerik.Web.UI%2c+Version%3d2010.1.415.35%2c+Culture%3dneutral%2c+PublicKeyToken%3d121fae78165ba3d4%3aen-US%3a3223ab34-72bf-4a9d-8a77-14f0f5e9365d%3a16e4e7cd%3af7645509%3a24ee1bba%3aa585d0d4%3ad312a85e
Line: 1
Source Code:
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[Scott Meyer]

I found out it was because of the position of the httpHandler in the web.config file (which is noted in the General Troubleshooting  documentation).

This link helped:
http://weblogs.asp.net/asptest/archive/2008/10/06/asp-net-ajax-and-http-handlers-a-cautionary-tale.aspx