Hi @ektajha90 and thanks for your query. In terms of designing a User Interface that incorporates eye tracking, indeed there are a number of different routes Tobii can offer you depending on the scenario and the existing framework you are using.
To get up and running quickly and get an idea of how to implement eye tracking into .NET, WPF and Console applications, you can check out the Tobii Core SDK:
Here is the landing page @ https://developer.tobii.com/consumer-eye-trackers/core-sdk/getting-started/
and you can download some sample applications @ https://github.com/Tobii/CoreSDK
For a more cross platform approach with a lower footprint and c++ support, you can use the Tobii Stream Engine API: https://developer.tobii.com/consumer-eye-trackers/stream-engine/
If you are interested in more exotic interfaces utilising 3D or VR components, you can have a look at our Unity SDK @ https://developer.tobii.com/tobii-unity-sdk/
Further options are available, but if you could kindly provide more detail with regard to your current UI design, we would be glad to help point you in the right direction. Best Wishes.