public Product_Supplier selectedProductSupplier { get; set; } //the product suppliers selected from the list of active package product suppliers

        //form constructor, sets active package, fills the product suppliers
        public frmEditProductSuppliers(Package package)
        {
            InitializeComponent();
            activePackage = package;
            Text = activePackage.PkgName;
            activePackage.fillSuppliers();
        }
 //set the active package based on the combo box selection
 private void cbPackages_SelectedIndexChanged(object sender, EventArgs e)
 {
     ClearControls();
     activePackage = (Package)cbPackages.SelectedItem;
     activePackage.fillSuppliers();
     DisplayPackage();
 }