Exception with ASPNET5 (beta) Item Temapltes

HI , 

I have an Item template project. In which I have a function for called GetProjectTypeGuids. 

public string GetProjectTypeGuids(EnvDTE.Project proj)        {            string projectTypeGuids = string.Empty;                        try            {                if (proj != null)                {                    object service = null;                    Microsoft.VisualStudio.Shell.Interop.IVsSolution solution = null;                    Microsoft.VisualStudio.Shell.Interop.IVsHierarchy hierarchy = null;                    Microsoft.VisualStudio.Shell.Interop.IVsAggregatableProject aggregatableProject = null;                    int result = 0;                    service = GetService(proj.DTE, typeof(Microsoft.VisualStudio.Shell.Interop.IVsSolution));                    solution = (Microsoft.VisualStudio.Shell.Interop.IVsSolution)service;                    result = solution.GetProjectOfUniqueName(proj.UniqueName, out hierarchy);                    if (result == 0)                    {                        aggregatableProject = (Microsoft.VisualStudio.Shell.Interop.IVsAggregatableProject)hierarchy;                        result = aggregatableProject.GetAggregateProjectTypeGuids(out projectTypeGuids);                    }                }            }            catch (Exception ex)            {                WriteErrorLog(ex);            }            return projectTypeGuids;        }

i am facing issue with the below line with ASPNET5 alone

aggregatableProject = (Microsoft.VisualStudio.Shell.Interop.IVsAggregatableProject)hierarchy;

Exception details:

Unable to cast object of type 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.ProjectNode' to type 'Microsoft.VisualStudio.Shell.Interop.IVsAggregatableProject'.

Please any one help me to resolve this type cast issue.how do i need to cast for ASPNET5 project

Kani