如何将所有组件添加到Visual Studio 2010的WPF应用程序工具箱中？

This is driving me crazy. I right clicked on the toolbox and selected all the components under WPF components tab and there are still components missing, such as LinearGradientBrush, RadialGradientBrush etc. Where are the missing components and where can I find their dlls? This is driving me crazy. I right clicked on th