Option to Show/Hide a chart

Hello,

Although this seems like a simple request, I can't seem to figure out the script that will allow me to Show/Hide a chart by checking and unchecking a Checkbox.

The Script I have right now reads:

if (CHECKBOX_3.isChecked())

{CHART_1.isVisible() == true;}

else {CHART_1.isVisible() == false;}

The code is not giving me an error but when I preview it, nothing happens when i unselect the checkbox.

Thanks so much,

Nikki