Trying to change boolean variable in sequence

I am trying to change a boolean variable from true to false/false to true within my sequence. I have a broadcast message event that is supposed to change the position of my textbox (down_textbox_cutscene). However, it does not work, and I am not sure why, the code for the event is provided bellow, I also realize this may not be enough information so please let me know what other info you may need.

if event_data[? "event_type"] == "sequence event"

{

switch (event_data[? "message"])

{

case "wake up whispy":

	down\_textbox\_cutscene = true;

break;

}

}