title: Angular2/4 mat-select multiple ngModel
body: <p>I have a mat-select dropdownlist with multiple enabled and am using NgModel to store user selected values.</p>
  <p>Problem is when I navigate to another page and come back the user-selected values aren't in the mat-select..I know the ngModel has those values...I am missing something...</p>
  <h1>HTML</h1>
  <pre><code>&lt;mat-form-field&gt;
   &lt;mat-select placeholder=&quot;Customers&quot; name=&quot;customerDetails&quot; ngDefaultControl       
   formControlName=&quot;customerDetails&quot; [(ngModel)]=&quot;custonerDetails&quot; 
   [formControl]=&quot;customerDetailsCtrl&quot; multiple   
   (ngModelChange)=&quot;onCustomerValueChanges(customer)&quot; &gt;
   
    &lt;mat-option *ngFor=&quot;let customer of customerDetailsResult&quot;
    [value]=&quot;customer&quot;&gt;{{customer.CustomerNo}}- 
                       {{customer.CustomerDescription}}
     &lt;/mat-option&gt;
   &lt;/mat-select&gt;
  &lt;/mat-form-field&gt;
  </code></pre>
  <p>Any ideas?</p>