WPF DataGrid not appear in Toolbox?

I am working with Visual studio 2008. I want to work on WPF DataGrid control.

I downloaded WPF toolkit and install it, and then added toolkit reference in my project, but it does not recognize Datagrid control, and does not show it in Toolbox, I even try to add it in toolbox through choose Item.. but when I click WPFToolki开发者_如何学Pythont.dll, it gives the error. And even if I write code in XAML it does not recognize dataGrid.

Ensure you have selected the WPF Components tab before pressing browse. You are telling it to look for WinForms controls in your screenshot.