private async void CB_Companies_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var company = this.GetSelectedCompany();
            await UnicontaAPIManager.SetCurrentCompany(company);

            LoadDebtors();
        }
        private async void CB_Company_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Setting Company
            var company = this.CB_Company.SelectedItem as Company;
            await UnicontaAPIManager.SetCurrentCompany(company);

            this.LoadCustomers();
        }
        private async void CompanyPicker_SelectedIndexChanged(object sender, System.EventArgs e)
        {
            var picker        = (Picker)sender;
            int selectedIndex = picker.SelectedIndex;

            if (selectedIndex == -1)
            {
                return;
            }

            var company = picker.ItemsSource[selectedIndex] as Company;
            await UnicontaAPIManager.SetCurrentCompany(company);

            await RefreshCustomers();
        }