Menu Icon not showing

hello, need help solving this:

<ion-header>
<ion-navbar hideBackButton >
<button ion-button menuToggle>
 <ion-icon name="menu"></ion-icon>
 </button>
 <ion-title>Main</ion-title>
 </ion-navbar>
 </ion-header>

Everything is working except the menu icon it won’t show but if i slide left the menu shows.
i don’t want to change the root page !

<ion-menu [content]=“content” persistent=“true”>
this is the solution