Because the Silverlight 2 RC that was released is aimed primarily at developers wishing to update their projects to the final version of Silverlight 2 due out sometime this year, we didn’t provide an update to Deep Zoom Composer because most everyone...(
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Read the complete post at http://blogs.msdn.com/expression/archive/2008/09/27/silverlight-2-rc-compatible-deep-zoom-project-templates.aspx