title: Angular Material dual binding ngModel not working on input textarea and mat-slide
body: <p>In my Angular Material app, I am using two controls which is textarea matInput and mat-slide-toggle. I followed the example online but somehow the ngModel is not working. For textarea I use ngModel, the data is not passed to the control. Only when I use [value] the data is posted on the control but any changes is not reflected back on the object. For the mat-side-toggle, [(ngModel)] does not work. I have to use [checked].</p>
  
  <p>How can I get dual binding working? thanks.</p>
  
  <pre><code>&lt;mat-card   &gt;
                    &lt;mat-card-content&gt;
                  &lt;div style="display:inline-block; "&gt;  
                      &lt;form class="full-form-wrapper"&gt;
  
                              &lt;mat-form-field style="width:600px;"&gt;
  
                              &lt;textarea matInput cdkTextareaAutosize #autosize="cdkTextareaAutosize" 
                                      cdkAutosizeMinRows="4"
  
                                      [formControl]="myCtrl"
                                      [readonly]="false"
                                      maxlength="300"
                                      id="description"
                                      cdkAutosizeMinRows="5"
                                      cdkAutosizeMaxRows="5" 
                                      width="500px"
                                      [value]="myObject.person.description"
                                      name="description"&gt;
                              &lt;/textarea&gt;
                            &lt;/mat-form-field&gt;
  
  
                            &lt;section class="example-section"&gt;
                              &lt;mat-slide-toggle
                              [(ngModel)]="checked"
                                [color]="primary"
  
                                [checked]="myObject.person.isActive"
                                [disabled]="false"&gt;
                                Is Active {{checked}}
                              &lt;/mat-slide-toggle&gt;
                            &lt;/section&gt; 
  
                      &lt;/form&gt;
                    &lt;/div&gt; 
                &lt;/mat-card-content&gt;
              &lt;/mat-card&gt; 
  </code></pre>