you need to write a UIEditor or designer, seeCreating Designable Components for Microsoft Visual Studio .NET Designers
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/pdc_vsdescmp.aspWriting Custom Designers for .NET Components
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/custdsgnrdotnet.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/pdc_vsdescmp.aspWriting Custom Designers for .NET Components
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/custdsgnrdotnet.asp
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