mat-select not giving underline and placeholder

Bug, feature request, or proposal:

Underline for the dropdown is not rendering and placeholder value is not displaying, please see the code below

<mat-select *ngIf="someCheck" 
  (ngModelChange)="updateonchange()" 
  [(ngModel)]="selectedvalue">
   <mat-option>
          Test
   </mat-option>
   <mat-option>
          Test1
   </mat-option>
</mat-select>

What is the expected behavior?

It was working fine with md-select, after the updating to the latest release, I am having this issue

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

“@angular/material”: “^5.0.0-rc0”, “@angular/animations”: “^5.0.1”, “@angular/cli”: “^1.5.0”, “typescript”: “^2.6.1”

using Ubuntu and Google Chrome

Is there anything else we should know?

Please check the screen shot

[kaziupir]

You should update examples on https://material.angular.io

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