I have just installed the Windows Phone Toolkit (http://phone.codeplex.com/) with the intention of using the ListPicker.
When I try and add it to the XAML it states that it's not valid for a Silverlight project. However when I started this project I chose Windows Phone, not Silverlight.
Any ideas what may be going wrong?
In your XAML,
you can do like this
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
<toolkit:ListPicker></toolkit:ListPicker>