How do I make a scrollgroup smaller than the window? I want to do this -
y2="%Todolist_height%-25" but this code does nothing. Can I do arithmetic with these variables?

This works but will not resize when the todolist height is changed.

<scrollgroup id="Todo List.scrollgroup" origin1="TOP-LEFT" x1="25" y1="40" origin2="TOP-RIGHT" x2="-15" y2="220" thumbelement="bitmap.scroll.thumb" barelement="bitmap.scroll.bar" barscaling="TILE" thumbscaling="TILE" thumbmargins="0,1,0,1" barmargins="0,0,0,0" showscrollbaraways="0" shrinktofit="1">

You should to define the origin2 as BOTTOM-RIGHT so that the item's height is relative to the window's height.

In order to get that to work I have to set the height on the window and then the window doesn't resize. It's driving me crazy.