Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 4.2.4
• Cross-platform modules: 4.2.1
• Android Runtime: 4.2.0
• iOS Runtime: 4.2.0
• NativeScript-Angular: 6.1.0
• Angular: 6.1.10

Describe the bug
Switch doesn't appear to support binding formControl to it as it doesn't set the default value of true, as well as it doesn't respond to changes to the value. It does however change the checked attribute.

I looked here and you said you had implemented this, although you only show an example with ngModel: #72

To Reproduce

Add the NativeScriptFormsModule and ReactiveFormsModule to AppModule:

@NgModule({
  imports: [
    NativeScriptModule,
    NativeScriptFormsModule,
    ReactiveFormsModule,
    AppRoutingModule
  ],
  exports: [
    NativeScriptModule
  ],
  declarations: [
    AppComponent
  ],
  providers: [],
  bootstrap: [AppComponent],
  schemas: [NO_ERRORS_SCHEMA]
})

export class AppModule {}

Then create a form using FormBuilder:

public form = this.fb.group({
    ongoing: this.fb.group({
      checked: [true]
    })
  });

Then try to bind the formControl to the Switch:

<Switch class="ongoing" [formControl]="form.get('ongoing.checked')"></Switch>

You will see that the value is still false and if you listen to valueChanges it doesn't emit when you change the value.

Expected behavior
I expect the formControl value to be bound to the checked state when binding formControl to it.