How do I solve issues with adding Tabbed Control with Expression Blend 3 for Silverlight App? I am using Microsoft Expression Blend 3 + SketchFlow Version 3.0.1927.0 for a Visual Studio 2008 Windows Embedded CE program. I am trying to add a tabbed control and Expression Blend does not seem to be cooperating. I have tried googling for a solution. I found this link: https://msdn.microsoft.com/en-us/library/cc295163.aspx This talks about SimpleTabControl and SimpleTabItem. I did not find these controls in my list of available controls I can add. This page says it is specific to WPF projects. Could this be the problem and this particular page from MSDN.Microsoft.com is not applicable to my Silverlight project? This web page says "The tab control is an items control that displays content in tabs". I have the ability to add an items control: http://i67.photobucket.com/albums/h292/Athono/Embedded/itemscontrolpng_zpsq6zokxvq.png The page also says "Typically, the child elements of a tab control are tab items, which are headered content controls, each of which can have a header element and a content element". I did not find the ability to add a headered content control from the graphic list of available controls. A google search also found this web page: http://www.dotnetperls.com/tabcontrol-wpf Trying this example producted this error: http://i67.photobucket.com/albums/h292/Athono/Embedded/tabcontroldoesnotexist_zpstq4euslm.png It says "The name 'TabControl' does not exist in the namespace 'http://schemas.microsoft.com/client/2007' " Trying an exact copy of the example code produces an error that says that "Window" does not exist in the namespace "http://schemas.microsoft.com/client/2007" http://i67.photobucket.com/albums/h292/Athono/Embedded/windowdoesnotexist_zpsy4dn8rkm.png I need to find an example or plan or solution for using a tab control for the namespace "http://schemas.microsoft.com/client/2007" I got some email / message suggestions on how to solve this issue. Some of the examples did not apply to my problem. But the ones that did apply, seeemed to imply that the way I have to solve this problem is to do the code entirely with CS using Visual Studio and not to deal with Expression Blend directly. Is this the only way to do it?