Yes, Erel, thanks - it's sure used, i have complex layouts that are 3 times nested, firstly loaded panels later load next level of layouts.
If the project is so that every element must be customizable (borders, colors, texts, paddings...) - all layouts must be made of only panels and labels that are elementary and max customizable. So, layouts are huge... searching would be useful, and maybe among all .bal layouts together.