"Closing" a popup layer

[spudmachine]

Hi everyone,
This one is so simple I must be missing something.

In the attached web file you will see a button that displays a popup layer called "My Popup Layer".

Clicking the "Show popup layer" button makes this layer appear, which is exactly what I want. But I would like to then "close" the popup layer by clicking on the X button on the popup layer (like a window). This does not work.

But if I click on the big grey rectangle in the popup layer then the popup layer DOES go away.

My settings:

To make the layer appear I go to the Web Properties for the "Show popup layer" button, and tell the Popup layer to appear when I click the button.

So then to make the popup layer go away I assumed that I go to the Web Properties for the "X" button and enter "My Popup Layer" again in the popup layer action. So in other words I'm assuming this action is like a toggle switch.

But it doesn't seem to work that way.

I'm confused.

Ideally I would only like the popup layer to go away when the user clicks the X area, and not when they click the big grey rectangle.

Cheers,
Geoff