public MainWindow()
{
InitializeComponent();
BIZ = new ClassBIZ();
UCC = new UserControlCustomer(BIZ);
UCDP = new UserControlDailyPrice(BIZ);
UCD = new UserControlDiesel(BIZ);
UCS = new UserControlSupplier(BIZ);
// We add the usercontrols as children of each of the respective grid from the tabs
CustomerGrid.Children.Add(UCC);
DailyPriceGrid.Children.Add(UCDP);
SalesGrid.Children.Add(UCD);
SupplierGrid.Children.Add(UCS);
BIZ.CallWebApi();
}