Note that importing any CPS related service moves your MEF part from the
VS default MEF catalog into a CPS catalog "sub-scope". Import properties
are only 'satisfied' when MEF activated your type (not simply by newing
up an instance of your object).
[Import]
IProjectService ProjectService { get; set; } IServiceProvider site; // the VS global service provider
var componentModel = site.GetService(typeof(SComponentModel)) as IComponentModel;
var projectServiceAccessor = componentModel.GetService<IProjectServiceAccessor>();
IProjectService projectService = projectServiceAccessor.GetProjectService();