Hi. I am currently working on designing a security system using grid of interactors (WPF application). It is stated in Tobii Guide that each interactor has a unique ID. I want to determine at which interactor the user is looking at and sent it to Mainwindow.xmal.cs by calling the function. I am searching for any example explaining how it can be done but was not able to find any. Please guide me how should I proceed from here.