private async void uxComboBoxAccounts_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (uxComboBoxAccounts.SelectedItem is string)
            {
                MessageBox.Show(AddDomainHintInstructions, Utils.AppName, MessageBoxButtons.OK, MessageBoxIcon.Information);
                uxComboBoxAccounts.SelectedItem = null;
                return;
            }
            _currentAccountItem = (AccountItem)uxComboBoxAccounts.SelectedItem;
            if (null == _currentAccountItem)
            {
                return;
            }
            using (var op = NewUxOperationWithProgress(uxComboBoxAccounts))
            {
                var vaui = new VaultAccessUserInteractive(_currentAccountItem.DomainHint);
                _currentAuthResult = vaui.AcquireToken(_currentAccountItem.AuthContext, ManagmentEndpoint);
                _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(_currentAuthResult.AccessTokenType, _currentAuthResult.AccessToken);
                var hrm = await _httpClient.GetAsync($"{ManagmentEndpoint}subscriptions?{ApiVersion}", op.CancellationToken);

                var json = await hrm.Content.ReadAsStringAsync();

                var subs = JsonConvert.DeserializeObject <SubscriptionsResponse>(json);

                uxListViewSubscriptions.Items.Clear();
                uxListViewVaults.Items.Clear();
                uxPropertyGridVault.SelectedObject = null;
                foreach (var s in subs.Subscriptions)
                {
                    uxListViewSubscriptions.Items.Add(new ListViewItemSubscription(s));
                }
            }
        }
        // Attempt to authenticate with current account.
        private void GetAuthenticationToken()
        {
            VaultAccessUserInteractive vaui = new VaultAccessUserInteractive(_currentAccountItem.DomainHint, _currentAccountItem.UserAlias);

            _currentAuthResult = vaui.AcquireToken(_currentAccountItem.AuthContext, ManagmentEndpoint, _currentAccountItem.UserAlias);
        }