Thanks everyone for checking in, my problem has come out today when i tried to parent the Bagnon bag frame to a kg panel.
I am not new to kg as I've used it for many years, but I am stuck right now.
When i parent the frame to BagnonFrameinventory (checked with Framestack) it seems fine and the panel get the width and height right, it also anchors fine, but everytime i reload the UI the panel never activate when i open my bags.
As soon as i change some panel options it appears and work 100%.
I can manage trying some script, and i tried some scripts myself but it seems that it's simply not loading the thing.
P.S. I have a dozen of other panels (with parenting and such) that loads fine.
Thanks in advance for your help, Marce