async onRequestSelectedContexts() {
			const aContexts = await this.byId("ProductList").getBinding("items")
				.requestSelectedContexts();
			MessageBox.information(
				aContexts.map((oContext) => oContext.getPath()).join("\n") || "none",
				{title : "Selected Products"});
		}
Requests the selected contexts in the expected order and shows them in a message box.