Microsoft.VisualStudio.Project.ReferenceNode.ShowObjectBrowser C# (CSharp) Method

        protected virtual int ShowObjectBrowser()
        {
            if(String.IsNullOrEmpty(this.Url) || !File.Exists(this.Url))
            {
                return (int)OleConstants.OLECMDERR_E_NOTSUPPORTED;
            }

            // Request unmanaged code permission in order to be able to creaet the unmanaged memory representing the guid.
            new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

            Guid guid = VSConstants.guidCOMPLUSLibrary;
            IntPtr ptr = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(guid.ToByteArray().Length);

            System.Runtime.InteropServices.Marshal.StructureToPtr(guid, ptr, false);
            int returnValue = VSConstants.S_OK;
            try
            {
                VSOBJECTINFO[] objInfo = new VSOBJECTINFO[1];

                objInfo[0].pguidLib = ptr;
                objInfo[0].pszLibName = this.Url;

                IVsObjBrowser objBrowser = this.ProjectManager.Site.GetService(typeof(SVsObjBrowser)) as IVsObjBrowser;

                ErrorHandler.ThrowOnFailure(objBrowser.NavigateTo(objInfo, 0));
            }
            catch(COMException e)
            {
                Trace.WriteLine("Exception" + e.ErrorCode);
                returnValue = e.ErrorCode;
            }
            finally
            {
                if(ptr != IntPtr.Zero)
                {
                    System.Runtime.InteropServices.Marshal.FreeCoTaskMem(ptr);
                }
            }

            return returnValue;
        }