The following ASP.NET controls are not compatible with partial-page updates, and are therefore not supported inside an UpdatePanel control:
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TreeView and Menu controls.
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Web Parts controls. For more information, see ASP.NET Web Parts
Controls.
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FileUpload controls when they are used to upload files as part of an asynchronous postback.
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GridView and DetailsView controls when their
EnableSortingAndPagingCallbacks property is set to true. The default is false.
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Login, PasswordRecovery, ChangePassword, and CreateUserWizard controls whose contents have
not been converted to editable templates.
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The Substitution control.
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Validation controls, which includes the BaseCompareValidator, BaseValidator, CompareValidator, CustomValidator, RangeValidator, RegularExpressionValidator, RequiredFieldValidator, and ValidationSummary control.
See a full list of controls, not compatible with RadAjax for ASP.NET AJAX from the official MS AJAX documentation here.