Solution configuration problem

>I just got a new machine and installed .NET 2005. In VB.NET 2005 in the old
>machine, under "Project" - "properties", in the "Compile" tab, I can see
>"Configuration" and "Platform" combo box with selection "Debug", "Release",
>"All Configuration". In the new machine I do not see the "configuration"
>combo box. Also, when I customize my toolbar (I drag "Build" - "Solution
>configurations" to the toolbar), the "Solution configurations" combo box is
>greyed out on the tool bar.
How can I change my project configuration from debug to release, and vice
versa ?
Thank you.
>