// avec System[0]["dict"] contenant {"normal":{"id":"normal","name":"Normal","color":"black"},"delete":{"id":"delete","name":"Delete","color":"red"}...}
varplus_event=""
// add new ngramid (and any present subforms) to currently modified group
// avec System[0]["dict"] contenant {"normal":{"id":"normal","name":"Normal","color":"black"},"delete":{"id":"delete","name":"Delete","color":"red"}...}
// -------------------------------------------
// prerequisite
varplus_event=""
// define "plus_event" symbol depending on "grouping" status
// normal situation: button allows to see group contents