Hassan Radmehr Newbie Poster

I installed Microsoft Report Viewer Redistributable 2008 and use report viewer control in the C# express 2008 win forms, also i installed Microsoft Report Viewer Redistributable 2010 and use it in the C# express 2008 win forms, but in c# express 2010 when i add reportviewer (2008 and 2010) to win form it is not visible at design-time, why?