Try \define bracketedCurrentTab() [[$(currentTab)$]]
<$button> <$action-sendmessage $message="tm-new-tiddler" $param="$:/_Blank" tags=<< bracketedCurrentTab>>/> New Arrangement </$button> Please note: Will fail if your title includes brackets. -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To post to this group, send email to tiddlywiki@googlegroups.com. Visit this group at http://groups.google.com/group/tiddlywiki. For more options, visit https://groups.google.com/d/optout.
