问题 I'm trying to use the AutoCompleteBox control from the february release of WPFToolkit. I install the toolkit using the .msi file, add the assembly reference, and only two new controls appears in my toolbox: Calendar and Datepicker. I then tried to handcraft the XAML as shown in WPF: AutoComplete TextBox, ...again, but once again, the AutoCompleteBox is missing. Also, since I've installed WPFToolkit, my toolbox has some strange behavior, like deleting all elements and not letting me add any