So I started work on a sample today and decided I wanted to use a Pivot control. I created a new project in Visual Studio and looked for the Pivot control in the Toolbox, but didn't find it. In the XAML editor I tried typing <phone:.and got Intellisense that suggested a Page, Frame or WebBrowser control, but I still did not see the Panorama or Pivot controls. I was a bit puzzled, but I haven't used these controls in awhile, so I looked up Pivot in the reference documentation. I saw that Pivot (and Panorama) are in the Microsoft.Phone.Controls namespace in the Microsoft.Phone.Controls assembly.
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