Local Action to unhide a messagebox.

[lamerjack]

{"page":4,"id":1,"obj":"btnmatrix","x":30,"y":20,"w":400,"h":200,"options":["0","1","2","3","4","\n","5","6","7","8","9"]}
{"page":4,"id":2,"obj":"btn","x":10,"y":210,"w":105,"h":90,"toggle":false,"text":"Normal Button","mode":"break","align":"center"}
{"page":4,"id":3,"obj":"msgbox","x":40,"y":280,"w":400,"h":180,"hidden":true,"text":"Confermi?","options":"OK\tForse"}

Hi All i have a situation similar to this...
there is a way to use local action in version 7 to unhide msgbox when i press the button with id 2?
Or i have to delegate this to openhab/homeassistant?