Hi Varun Kumar,
please try to keep a clear separation between your GUI application and your underlying system (whatever it does). Instead of adding some screens within the device class - just send a system event from the device class and let the GUI application react accordingly. The device class is just the interface to the underlying system without any information about your GUI implementation. This means, each time when some event happens (e.g. a certain timer in your backend is expired), you can send a system event to your GUI application.
Please have a look to the chapter System Event and System Event Handler for more details.
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