How to make Scrollable and Resizable (to vertical way) Maintained Window?

[MirageKnight]

After GU53, I can't figure out how to make maintained buff window to scroll to show all 30 buffs. It was working fine before GU53.

This is because I have almost 18 maintained buffs all the time and I would like to make maintained buff window to scroll down to show blank 12 buff slots before combat so I can keep track of my debuff/buff in combat.

Currently, this xml only allow to scroll down when I made window small for some reason.
I have tried to resize and so on but can't figure out how to do this myself.

I appreciate any help Thank you.

link

I haven't got time to work on this till now, so I have re-written entire code but still can't make all maintained buff slot scrollable. Not sure what has been changed since GU53 on maintained window mechanism.

Can anyone teach me how to make scrollable and resizable (to vertial) maintained window (even slot not filled with buffs.)? (i.e when 18buffs on, allow to scroll down so can see the buff slots that empty yet to see which buff/proc triggered.)