You can check the post of Web Developer team for more detailed info.
Here are few RadControls related details:
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Enjoy!
Here are few RadControls related details:
...
| Issue | Many NBSPs added and tag name corruption when editing a page that uses Telerik controls (popular custom controls) |
| Description | When there are multiple register directives for the same namespace in different assemblies, multiple NBSPs may be generated in your page and your markup could possibly be changed incorrect. This can be seen when using some Telerik controls. |
| Resolution | VS no longer changes your code incorrectly |
| Link | http://forums.asp.net/t/1185266.aspx |
| Issue | Telerik Controls Not Working in Visual Studio 2008 |
| Description | Some telerik control configuration aren’t working properly in all cases in VS2008. Specifically, if you click on the RadAjaxManager and click Configure Ajax Manager, you will get an empty collection when you inherit from a master page. |
| Resolution | You now get the appropriate collection when using this configuration utility. |
| Link | http://www.telerik.com/community/forums/thread/b311D-bbgthd.aspx |
Enjoy!