public MyRecipeBook(IRecipeManager businessLayer)
{
BusinessLayer = businessLayer;
Recipes = BusinessLayer.GetRecipes();
RecipeTypes = BusinessLayer.GetRecipeTypes();
RawMaterials = BusinessLayer.GetRawMaterial();
Units = BusinessLayer.GetUnits();
Soups = new ObservableCollection <Recipe>(Recipes.Where(r => r.Type.Name == "Leves"));
MainCourses = new ObservableCollection <Recipe>(Recipes.Where(r => r.Type.Name == "Főétel"));
Desserts = new ObservableCollection <Recipe>(Recipes.Where(r => r.Type.Name == "Desszert"));
}