//Add new manufacturer
        private void AddManBtn_Click(object sender, RoutedEventArgs e)
        {
            singleInput manInput = new singleInput(temp);

            if (manInput.ShowDialog() == true)
            {
                man.Add(temp);
                this.SetComboValues(cat, man);
                ManCombo.SelectedItem = temp;
            }
        }
        //Add new categroy
        private void AddCatBtn_Copy1_Click(object sender, RoutedEventArgs e)
        {
            singleInput catInput = new singleInput(temp);

            if (catInput.ShowDialog() == true)
            {
                cat.Add(temp);
                this.SetComboValues(cat, man);
                CategoryCombo.SelectedItem = temp;
            }
        }