Angular ngNativeValidate 不适用于primeng 下拉菜单

Question

我使用 ngNativeValidate 进行表单验证。它不适用于primeng p-dropdown。有没有办法解决这个问题？

<form #myform="ngForm" (ngSubmit)="onSubmit()" ngNativeValidate>
  <p-dropdown [(ngModel)]="selectedTime" [required]="true" [options]="timeZones" optionLabel="zone" 
    placeholder="Select A Time" >
</form>