Adding track number to title

[Zee]

I like to add the tracknumber to to title so the tracknumber is displayed as a prefix to the title in "now playing", in "playlist". and in all search results.

I tried adding the following to the tagFormat property (I want to have a space as separator between the track number and the title), but it doesn't work:
Title.displayFormat={$tracknumber$title^^^ }

What am I doing wrong?

tnx in advance!