How to add a custom column to all tabs

[LittleBiG]

I have a new custom column (16) with a small script: return property("#ItemCount",<cc_item>);
I created this on a tab first, but it proved to be very useful, so I want to add it to all of my folder tabs. I always use the SHIFT+click on the column name, to add a column to all tabs. But in this case, the magic doesn't work. It is ok, when I try to add like "Len", but the ItemCount custom column doesn't get through. I don't know if it is a bug, or I shouldn't have expected this behavior regarding custom columns.
Anyway, does anybody know an easy solution?

[admin]

The Shift-trick works with the first five custom columns.