How to get the Settings "window" to PresentUI for captive portals in NEHotspotHelper implementation

Hi,

Recieved the NEHotspotHelper entitlement today and have been experimenting with it for almost 6 hours now. Got most of the parts working including auto-join for psk networks using passwords from the app. However when the network is a captive one, on which window should I present my custom view to interact with the captive portal? I tried it with UIApplication.sharedApplication as AppDelegate and used its window, but the app isn't pushed to the foreground. Is there a window on the Settings app on which I can present my UIVIewController because I've seen an app do this.Here is the snippet of my code.

switch command.commandType {
        case .FilterScanList:
 
            var networkListCanHandle = [NEHotspotNetwork]()
 
            guard let networkList = command.networkList else {
                print("No networks in the filter scan list")
                return
            }
        
            for network in networkList {
      
                network.setConfidence(.High)
                networkListCanHandle.append(network)
 
            }
        
            let response = command.createResponse(.Success)
            response.setNetworkList(networkListCanHandle)
            response.deliver()
        
        case .Evaluate: 
            guard let network = command.network else {
                print("Network not present")
                return
            }
        
            if network.SSID == "My Captive Portal" {
                network.setConfidence(.High)
                let response = command.createResponse(.Success)
                response.setNetwork(network)
                response.deliver()
            }
 
        case .Authenticate:
          
            guard let network = command.network else {
                print("Network not present")
                return
            }
        
            if network.SSID == "My Captive Portal" {
                network.setConfidence(.High)
                let response = command.createResponse(.UIRequired)
                response.setNetwork(network)
                response.deliver()
            }
        
        
        case .PresentUI:
          
            dispatch_async(dispatch_get_main_queue(), {
                    let customController: UIAlertController = UIAlertController(title: "Captive Login", message: "Let us handle the login", preferredStyle: .Alert)
                   // What should be the window here?? 
                    self.window?.rootViewController?.presentViewController(customController, animated: true, completion: nil)
               })
        
        
        case .Maintain:
             break
        
        case .Logoff:
            break
        
        case .None:
            break
}