A single button widget for toggling vr mode.
    
    
    
    
    
    
        
| Name | Type | Default | Description | 
|---|---|---|---|
| container | Element | String | The DOM element or ID that will contain the widget. | |
| scene | Scene | The scene. | |
| vrElement | Element | String | document.body | optional The element or id to be placed into vr mode. | 
Throws:
- 
    DeveloperError : Element with id "container" does not exist in the document.
Members
- 
    
    Gets the parent container.
- 
    viewModel : VRButtonViewModel
- 
    
    Gets the view model.
