Expression Blend 4 - AutoCompleteBox not available for WPF application

It looks like there is an AutoComplete box in Expression Blend 4, but it looks like it doesn't let you use it on a regular WPF application. Can this be true? Is it only available for Silverlight applicti开发者_运维百科ons? If so, is there one I can use in a WPF application written for .Net 4?

Indeed, the AutoCompleteBox is only available in Silverlight... no idea why. However, there are plenty of auto-complete textbox implementations for WPF... See this answer for details :

AutoComplete TextBox in WPF

Seems WPF toolkit has an AutoCompleteBox.