Hi @tzaccai, I am afraid that the eye status indicator bundled in the Tobii Core Software does not have an API for using it in this fashion that you specify, accordingly you will need to develop something similar using the Core SDK Interaction API.
Whilst the Tobii Core SDK does provide samples available @ https://github.com/Tobii/CoreSDK
These are tailored toward interaction purposes not graphical representation of eye gaze data. That being said, with the Tobii Pro SDK there is indeed included a number of .NET samples that do show you the means to show visually gaze stream data available @ https://www.tobiipro.com/product-listing/tobii-pro-sdk/#Download (3D Eyes Sample)
Please bear in mind, you will only be able to use these samples as a guide as the Pro SDK will not work with the 4C Tracker unless with a special licence. At any rate, I hope this information is of use to use.