onShown property
      
      EventStream<JSObject> 
      get
      onShown
      
    
    
Fired when the sidebar pane becomes visible as a result of user switching to the panel that hosts it.
Implementation
EventStream<JSObject> get onShown =>
    _wrapped.onShown.asStream(($c) => (JSObject window) {
          return $c(window);
        }.toJS);