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Message: [QUOTE="Yuan Ren[MSFT], post: 4256132"] Hi Christophe, Thanks for posting! For the current issue, based on my experience, this functionality is based on design time support in ASP.NET custom control. Unfortunately, I don't find any specific sample codes for the current requirement. However, there is a good resource from MSDN document explains the whole architecture of the design time support. The document also demonstrates how to use the design time support: [URL]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/htm[/URL] l/cpcondesign-timeforwebforms.asp If you are interest in the theory of design time support, please look the following article: [URL]http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/htm[/URL] l/cpconenhancingdesign-timesupport.asp Although there is no specific sample for the current issue, there still have many resources from third party to demonstrate how to do: [URL]http://www.codeproject.com/useritems/design-time-integration.asp[/URL] [URL]http://www.15seconds.com/issue/040422.htm[/URL] Hope this will be helpful! Regards, Yuan Ren [MSFT] Microsoft Online Support [/QUOTE]