Thank you for answering so quick MatzeOGH!
Okay! I’m trying what you say now. But I have a problem, where should I set my event tick?
I’m saying this because I’m trying to set it on my widget event graph, but I cannot call my function OnMouseMove (it’s an overriden function for the panel border from my designer tab).
Here’s a screenshot:
I also considered to implement it on my FPC Blueprint but I don’t know how to make my CastToWidget properly from there (I’m a beginner on Blueprints).