GO to link below , download and install Microsoft Silverlight 3 Tools
http://www.microsoft.com/downloads/details.aspx?familyid=9442b0f2-7465-417a-88f3-5e7b5409e9dd&displaylang=en
Silverlight 3 Tools for Visual Studio 2008 SP1 includes:
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Visual Basic and C# Project templates
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Intellisense and code generators for XAML
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Debugging of Silverlight applications
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Remote debugging of Silverlight applications for Mac
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Web reference support
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WCF Templates
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Team Build and command line build support
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Support for cached transparent platform extensions
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Support for Silverlight 3 Out-of-Browser applications
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amiT jaiN
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