title: How to disable form formGroup?
body: <p>I need to use something like this:</p>
  
  <pre><code>&lt;form [formGroup]="" [disabled]="func(formGroup, cond)"&gt;
  </code></pre>
  
  <p>And disable this:</p>
  
  <pre><code>    funct(form, cond) {
  
        if (cond) {
            form.disable();
         }
  
       }
  </code></pre>