MVVM listbox selection problem with MessageBox

<toolbarbutton
	label="${labels.email.search.btn.details}"
	disabled="@load(empty vm.selected)"
	image="/images/buttons/details.png"
	onClick="@command('doViewDetails')" />

@Command
	public void doViewDetails() {
		Executions.getCurrent().sendRedirect(
			"account/details-account.zul?username="
			+ getSelected().getUsername(), "_blank");
	}

<toolbarbutton image="/images/buttons/reset.png"
	disabled="@load(empty vm.selected)"
	label="${labels.account.search.reset}"
	onClick="@command('doReset')" />

@Command
@NotifyChange({ "accounts", "selected" })
public void doReset() {
	Messagebox.show("Do you want to reset the password for the account "
		+ selected.getUsername() + "?", new Messagebox.Button[] {
		Messagebox.Button.NO, Messagebox.Button.YES },
			new EventListener<Messagebox.ClickEvent>() {
			public void onEvent(Messagebox.ClickEvent event) {
				if (Messagebox.Button.YES.equals(event.getButton())) {
				try {
					accountBean.resetAccountPassword(selected.getUsername());
					Messagebox.show("Account password for "
						+ selected.getUsername()
						+ " has been reset successfully.",
						"Info", Messagebox.OK,
						Messagebox.INFORMATION);
				} catch (WebException e) {
					LOGGER.error("Error resetting the account password", e);
					Messagebox.show("Error while resetting the password for account "
					        + selected.getUsername() + "\n"
						+ e.getMessage(), "Error",
						Messagebox.OK, Messagebox.ERROR);
				}
			}
		}
	});
}

accountBean.resetAccountPassword(selected.getUsername());