Hi, I've a problem. Is it possibly to use the sheet worker to uncheck a checkbox when I press the roll button? I usually use on("change:<attr_name>",... but it doesn't work with <roll_name> for me. The idea is (in a really bad pseudocode form): on ("change:<roll_attack_pressed>", function(){ if (checkbox=="on"){ setAttr(checkbox: 0); } } This would be used for action like aim, that gives the player +20% for one turn if they are not hit in the meantime (I've already set up a flag related to the on("change:HP") ). It's a minor thing, but it happens every time that a player or a handler forget to use (or remove) the aim modifier to their rolls.