.visble does not work

I am making a script, that when press a button, the entity will disappear and reappear, the entity pointer is working now, but .visible parameter doesnot work. I also have tested .visible without any function, but it bring nothing
my script here

Code:

---

Entity* obj_labo;

var labo_appear = 0;

Action act_labo
{
	obj_labo = my;
}


function fcnt_labo()
{
	if (labo_appear == 0)	
	{
		//obj_labo.material = crome;
		obj_labo.visible = off;
		obj_labo.passable = off;
		labo_appear = 1;
	}
	else
	{
		obj_labo.visible = off;
		obj_labo.passable = on;
		labo_appear = 0;
	}
}

---

The entity has the action: act_labo
==
Anyone knows please help

use .invisible for entities.

tks. it works now