I got it working. It turns out that when you add a TRIGGERcmd command to the Webcore device list on your SmartPhone (Webcore > Settings > Available Devices), you have to scroll way down the screen to the Switches section. Normally most devices will show up at the top in the Actuators section.

I use WebCore for creating SmartThings scripts. Typically when I add a SmartApp to SmartThings, the functions of that app will also show up in the WebCore device lists, but for some reason, that is not happening with the TRIGGERcmd SmartApp. The triggers show up in the SmartThings app, but not in WebCore.

Any idea why the TRIGGERcmd commands will not show up in WebCore?