title: Kendo Cancel dropdownlist selectionChange event
body: <p>I use Kendo-angular library. When user select an item in my dropdownlist, the selectionChange event is triggered and based on some conditions I want to cancel the change event and revert to previously selected value in the dropdownlist.</p>
  
  <p>Can this be achieved with the kendo dropdownlist component ? </p>
  
  <pre><code>&lt;kendo-dropdownlist 
  [data]="services" 
  [textField]="'defaultLabel'" 
  [valueField]="'id'" 
  [(ngModel)]="selectedService"
  placeholder="Select a service" 
  (valueChange)="onServiceChanged($event)"&gt; 
  &lt;/kendo-dropdownlist&gt;
  
  
   onServiceChanged(event) { }
  
  //event is the actual selected value, not the event
  </code></pre>