How to prevent ReSharper from shortening namespaces when adding using directives?

When I use ReSharper to add a using directive (using Alt+Enter) it removes "unnecessary" parts of the namespace. I prefer using the full namespace which is also the behavior of Visual Studio.

Example:

namespace MyCompany.MyTool.Data
{
    // This is what ReSharper gives me:
    using Core;

    // This is what I want:
    using MyCompany.MyTool.Core;

    // ...
}

Which setting do I have to change in ReSharper 4.5 so it uses the full namespace?