GuerillaBuild, I was thinking the same thing as you initially, but he's attaching the PS to the button on the System activity ... so the references of onHold and onHoldInterval should be properly set for the button they're attached to.

I think you're close ... you've got the right code in the right location. I think what you may be missing is the activity or page reference? It does depend on what "TAG" is, a page or activity. My guess is that you didn't add in a TAG page to the System activity ... so you're missing the activity reference.

CF.widget("widget_ps_name","page_ps_name","activity_ps_name").executeActions();

You probably just need to give your activity a PS name and include that in your script.