Telerik blogs
You can check the post of Web Developer team for more detailed info.

Here are few RadControls related details:
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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
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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!

About the Author

Vladimir Enchev

is Director of Engineering, Native Mobile UI & Frameworks

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