private void ShowToolWindow(object sender, EventArgs e)
        {
            ThreadHelper.JoinableTaskFactory.RunAsync(async delegate
            {
                await FooAsync(); // this line is what adds the VSTHRD010 diagnostic
            });
        }
        
        private async Task FooAsync()
        {
            await ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync();
        }