Dynamo.Controls.DynamoView.WindowClosing C# (CSharp) Method

        private void WindowClosing(object sender, CancelEventArgs e)
        {
            if (!PerformShutdownSequenceOnViewModel() && !DynamoModel.IsTestMode)
            {
                e.Cancel = true;
            }
            else
            {
                isPSSCalledOnViewModelNoCancel = true;
            }
        }