ScrollPanel - how to tie border into alwaysShowScrollBars=false?

What's the best way to tie a border into the auto show scroll bars?

In other words, 

a) if the contents fit - no scroll bar AND no border...  it's a nice bland panel that blends in...

BUT

b) if the contents do not fit - add the scroll bar (automatically handled) *AND* add a border to go along with the scroll bar...

 

Is there an attribute setting for this or do we have to tie into the same event that triggers the scroll bar?  If an event what one is it?

 

THANKS!

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