This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
It looks as if you're creating a PDF document with an embedded chart. Be aware that there's no guarantee that it will be displayed - the user may have set the browser to save PDF files to disk, or may not have installed a PDF-displaying browser plugin.
You still need to set the content type to something appropriate ("application/pdf", if I remember correctly).