Microsoft.VisualStudio.Project.ReferenceContainerNode.ExecCommandOnNode C# (CSharp) Method

        protected override int ExecCommandOnNode(Guid cmdGroup, uint cmd, OLECMDEXECOPT nCmdexecopt, IntPtr pvaIn, IntPtr pvaOut)
        {
            if(cmdGroup == VsMenus.guidStandardCommandSet2K)
            {
                switch((VsCommands2K)cmd)
                {
                    case VsCommands2K.ADDREFERENCE:
                        return this.ProjectManager.AddProjectReference();
                    case VsCommands2K.ADDWEBREFERENCE:
                        return this.ProjectManager.AddWebReference();
                }
            }

            return base.ExecCommandOnNode(cmdGroup, cmd, nCmdexecopt, pvaIn, pvaOut);
        }