Add icons to Dialog buttons in Angular Dialog component

import { Component, ViewChild, OnInit, ElementRef } from '@angular/core';
import { DialogComponent } from '@syncfusion/ej2-angular-popups';
import { EmitType } from '@syncfusion/ej2-base';

@Component({
    selector: 'app-root',
    template: `<button class="e-control e-btn" style="position: absolute;" id="targetButton" (click)="onOpenDialog($event)">Open Dialog</button>
    <div #container class='root-container'>
      <ejs-dialog id='dialog' #ejDialog [animationSettings]='animationSettings' content='Are you sure you want to permanently delete all of these items?' header='Delete Multiple Items' [target]='targetElement'
      width='300px' [showCloseIcon]='showCloseIcon' [buttons]='buttons'>
      </ejs-dialog> </div> `
})

export class AppComponent implements OnInit {
    @ViewChild('ejDialog') ejDialog: DialogComponent;
    // Create element reference for dialog target element.
    @ViewChild('container', { read: ElementRef }) container: ElementRef;
    // The Dialog shows within the target element.
    public targetElement: HTMLElement;

    //To get all element of the dialog component after component get initialized.
    ngOnInit() {
      this.initilaizeTarget();
    }

    // Initialize the Dialog component's target element.
    initilaizeTarget: EmitType<object> = () => {
      this.targetElement = this.container.nativeElement.parentElement;
    }

    //Animation options
    public animationSettings: Object = { effect: 'Zoom', duration: 400, delay: 0 };

    public showCloseIcon: boolean = true;
    // Hide the Dialog when click the footer button.
    public hideDialog: EmitType<object> = () => {
        this.ejDialog.hide();
    }
    // Enables the footer buttons
    public buttons: Object = [
        {
            'click': this.hideDialog.bind(this),
            // Accessing button component properties by buttonModel property
              buttonModel:{
              content:'Yes',
              iconCss: 'e-icons e-ok-icon',
              //Enables the primary button
              isPrimary: true
            }
        },
        {
            'click': this.hideDialog.bind(this),
            // Accessing button component properties by buttonModel property
              buttonModel:{
              content:'No',
              iconCss: 'e-icons e-close-icon'
            }
        }
    ];
    // Sample level code to handle the button click action
    public onOpenDialog = function(event: any): void {
        // Call the show method to open the Dialog
        this.ejDialog.show();
    }
}

import { Component, ViewChild, OnInit, ElementRef } from '@angular/core';
import { DialogComponent } from '@syncfusion/ej2-angular-popups';
import { EmitType } from '@syncfusion/ej2-base';

@Component({
    selector: 'app-root',
    template: `<button class="e-control e-btn" style="position: absolute;" id="targetButton" (click)="onOpenDialog($event)">Open Dialog</button>
    <div #container class='root-container'></div>
      <ejs-dialog id='dialog' #ejDialog [animationSettings]='animationSettings' (close)='dialogClose()' content='Are you sure you want to permanently delete all of these items?' header='Delete Multiple Items' [target]='targetElement'
      width='300px' [showCloseIcon]='showCloseIcon'>
      <ng-template #footerTemplate>
          <div>
            <button id="Button1" class="e-control e-btn e-primary e-flat" (click)="btnclick($event)" data-ripple="true">
            <span class="e-btn-icon e-icons e-ok-icon e-icon-left"></span>Yes</button>
            <button id="Button2" class="e-control e-btn e-flat" (click)="btnclick($event)" data-ripple="true">
            <span class="e-btn-icon e-icons e-close-icon e-icon-left"></span>No</button>
          </div>
      </ng-template>
      </ejs-dialog>
        `
})

export class AppComponent implements OnInit {
    @ViewChild('ejDialog') ejDialog: DialogComponent;
    // Create element reference for dialog target element.
    @ViewChild('container', { read: ElementRef }) container: ElementRef;
    // The Dialog shows within the target element.
    public targetElement: HTMLElement;

    //To get all element of the dialog component after component get initialized.
    ngOnInit() {
      this.initilaizeTarget();
    }

    // Initialize the Dialog component's target element.
    initilaizeTarget: EmitType<object> = () => {
      this.targetElement = this.container.nativeElement.parentElement;
    }

    //Animation options
    public animationSettings: Object = { effect: 'Zoom', duration: 400, delay: 0 };

    public showCloseIcon: boolean = true;
    // Hide the Dialog when click the footer button.
    public hideDialog: EmitType<object> = () => {
        this.ejDialog.hide();
    }

    public btnclick = function(): void {
        this.ejDialog.hide();
    }

    // Sample level code to handle the button click action
    public onOpenDialog = function(event: any): void {
        // Call the show method to open the Dialog
        this.ejDialog.show();
    }
}