void Category::inOrder(CatNode* &t, int counter) {
   	if (t != NULL)
	{
		inOrder(t->left, counter);
		counter++ ;
		cout << counter << "\t" << t->item.getItemID() << "\t" << t->item.getName() << "\t$" << t->item.getPrice() << endl;
		inOrder(t->right, counter);
	}
}