Navigation Tree - Selected Border Syntax?

It has been a while since I setup from start the Navigation tree.
Can someone help me out with the syntax for Selected Border (or Border)?
Trying to establish the Border and color for when an item is selected.
My memory says it is something along these lines -
border;color(line, 255,0,0,255);1)
This is in the Data set editor.

I am getting the orange background color but no line.

I finally got the syntax correct.

border(line;color(255,0,0,255);1)

It's a little buried, but for posterity the string syntax for borders is documented on the toBorder page:

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