Take a look at the script (line 187). It uses the SQLDMOScript_Triggers property. This means that when the call to object.script (line 196) is made, the trigger will also be generated inside the TAB file for that table. I often used this option, and I am able to get the triggers that way.
If you need to, the table object exposes a triggers collection which allows you to select each trigger object.
I hope this helps