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SharePoint Configuration
This article explains the configuration needed, in order for the RadProgressArea to work in SharePoint.
The RadProgressArea would not work correctly in SharePoint if there is a RadUploadModule declaration in the project's web.config, so if such is present it must be removed:
XML
<modules>
<add name="RadUploadModule" preCondition="integratedMode" type="Telerik.Web.UI.RadUploadHttpModule" />
</modules>