Error in the search box ion-searchbar

With this code below the search work normal however the cancel button in iOS and arrow close / back on Android as it should work is not displayed, what you can is wrong?

	<ion-toolbar no-border-top *ngIf="searching">
		<ion-searchbar #searchbox focuser id="searchbox" placeholder="Sonhei com..." [(ngModel)]="searchText" showCancelButton="true" cancelButtonText="Cancelar" (keyup.enter)="doSearch()" (ionCancel)="stopSearching()"></ion-searchbar>
	</ion-toolbar>