public CategorieUC(Bierkroeg b, BMSModelContainer db, ProductCategorie pc, KassaUC kuc)
{
InitializeComponent();
_bierkroeg = b;
_db = db;
_pc = pc;
_kuc = kuc;
ic_Producten.ItemsSource = _bierkroeg.Producten.Where(p => p.ProductCategorieId == _pc.Id).OrderBy(p => p.ProductNaam).ToList();
}
void switchUC()
{
g_Placeholder.Children.Clear();
UserControl _uc = new KassaUC(_bierkroeg, _db, _dag);
_uc.Width = g_Placeholder.Width;
_uc.Height = g_Placeholder.Height;
g_Placeholder.Children.Add(_uc);
}