StackLayoutPanel within a ScrollPanel

I want a StackLayoutPanel with a bar for each letter of the alphabet.
The idea is that Contacts will be organised within the appropriate
bar.

All works fine, except when I try to put my SLP within a ScrollPanel
so that I can have a shorter window.
When I do this, I see the "A" bar only, the rest of the SP is blank.
If I look at the DOM, I can see the other bars with descending
positive values of style-bottom. Thus they are rendering with Z
immediately above the A (and outside my viewable window), Y above Z
and so on.

Any ideas how to make SLP and SP play nice together?

best
Roy

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