private void Button_Click_Add(object sender, RoutedEventArgs e)
 {
     if (TabItem_Users.IsSelected)
     {
         var user = new ViewUser();
         var userWindow = new UserWindow(user);
         userWindow.ShowDialog();
         UpdateUsers();
     }
     else if(TabItem_ObjOfTransact.IsSelected)
     {
         var objOfTransact = new ViewObjOfTransact();
         var objOfTransactWindow = new ObjOfTransactWindow(objOfTransact);
         objOfTransactWindow.ShowDialog();
         UpdateObjectOfTransaction();
     }
     else if(TabItem_Deals.IsSelected)
     {
         var viewDeal = new ViewDeal();
         var dealWindow = new DealWindow(viewDeal);
         dealWindow.ShowDialog();
         UpdateDeals();
     }
 }
        private void Button_Click_Correct(object sender, RoutedEventArgs e)
        {
            if (TabItem_Users.IsSelected )
            {
                if (DataGrid_Users.SelectedItem != null)
                {
                    var user = (ViewUser)DataGrid_Users.SelectedItem;
                    var userWindow = new UserWindow(user);
                    userWindow.ShowDialog();
                    UpdateUsers();
                }
                else
                {
                    MessageBox.Show("Select some item!");
                }

            }
            else if (TabItem_ObjOfTransact.IsSelected)
            {
                if (DataGrid_ObjOfTransact.SelectedItem != null)
                {
                    var objOfTransact = (ViewObjOfTransact)DataGrid_ObjOfTransact.SelectedItem;
                    var objOfTransactWindow = new ObjOfTransactWindow(objOfTransact);
                    objOfTransactWindow.ShowDialog();
                    UpdateObjectOfTransaction();
                }
                else
                {
                    MessageBox.Show("Select some item!");
                }

            }
            else if (TabItem_Deals.IsSelected)
            {
                if (DataGrid_Deals.SelectedItem != null)
                {
                    var viewDeal = (ViewDeal)DataGrid_Deals.SelectedItem;
                    var dealWindow = new DealWindow(viewDeal);
                    dealWindow.ShowDialog();
                    UpdateDeals();
                }
                else
                {
                    MessageBox.Show("Select some item!");
                }

            }
        }