private void BTN_AddProject(object sender, RoutedEventArgs e)
        {
            AddNewManFactOrSupplier adnm = new AddNewManFactOrSupplier("Project");

            adnm.Show();
        }
        private void BTN_AddCategory(object sender, RoutedEventArgs e)
        {
            AddNewManFactOrSupplier adnm = new AddNewManFactOrSupplier("Category");

            adnm.Show();
        }
        private void BTN_AddLocation(object sender, RoutedEventArgs e)
        {
            AddNewManFactOrSupplier adnm = new AddNewManFactOrSupplier("Location");

            adnm.Show();
        }
        private void BTN_AddManufacturer(object sender, RoutedEventArgs e)
        {
            AddNewManFactOrSupplier adnm = new AddNewManFactOrSupplier("Manufacturer");

            adnm.Show();
        }