By default, Microsoft Office applications do not display the Developer tab on the Ribbon. You might need to access this tab to perform a task while you are developing an Office solution in Visual Studio. For example, if you want to add a GroupContentControl to a document-level customization for Microsoft Office Word, you must use the Developer tab in Word.
Applies to: The information in this topic applies to document-level projects and application-level projects for the following applications: Excel 2007 and Excel 2010; InfoPath 2010; Outlook 2007 and Outlook 2010; PowerPoint 2007 and PowerPoint 2010; Project 2010; Visio 2010; Word 2007 and Word 2010. For more information, see Features Available by Office Application and Project Type.
To show the Developer tab for Microsoft Office 2010 applications
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Start the application.
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Click the File tab.
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Click Options.
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In the categories pane, click Customize Ribbon.
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In the list of main tabs, select Developer.
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Click OK to close the Options dialog box.
To show the Developer tab for Word 2007, Excel 2007, and PowerPoint 2007
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Start the application.
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Click the Microsoft Office Button.
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Click Word Options, Excel Options, or PowerPoint Options.
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In the categories pane, click Popular.
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Select Show Developer tab in the Ribbon.
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Click OK to close the Options dialog box.
To show the Developer tab for Outlook 2007
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Start Outlook.
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On the Tools menu, click Options.
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In the Options dialog box, click the Other tab, and then click Advanced Options.
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In the Advanced Options dialog box, select Show Developer tab in the Ribbon, and then click OK.
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Click OK to close the Options dialog box.
Reference: http://msdn.microsoft.com/en-us/library/bb608625(VS.100).aspx
