[Trigger] Train Comp Troops

[Masterful_Tauren]

This trigger confuses me. I have no idea how to make it. Its like the trigger in Alliance VS. the Horde. When you get the Peon to make a building, it will have troop icons like Tauren, which says -adds 1 Tauren to the spawn...or something similar to that.My question is, how do I make a trigger similar to that?

 

[Xelephant]

• Meele
  • Events
    • Time - Every 15.00 seconds of game time
  • Conditions
  • Actions
    • Player Group - Pick every player in (All players) and do (Actions)
  • Loop - Actions
    • Unit Group - Pick every unit in (Units owned by (Picked player) of type Meele Tower 1) and do (Actions)
      • Loop - Actions
        • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
          • If - Conditions
            • ((Picked unit) belongs to an ally of Player 1 (Red)) Equal to True
          • Then - Actions
            • Unit - Create 1 SpawnArray[(Round + 12)] for EastWest[0] at (Position of (Picked unit)) facing (Random point in West <gen>)
            • Unit - Add a 180.00 second Generic expiration timer to (Last created unit)
            • Unit - Order (Last created unit) to Attack-Move To (Random point in West <gen>)
            • Unit - Change color of (Last created unit) to (Color of (Owner of (Picked unit)))
            • Set UnitStats[1] = (UnitStats[1] + 1)
          • Else - Actions
            • Unit - Create 1 SpawnArray[(Round + 12)] for EastWest[1] at (Position of (Picked unit)) facing (Random point in Ost <gen>)
            • Unit - Add a 180.00 second Generic expiration timer to (Last created unit)
            • Unit - Order (Last created unit) to Attack-Move To (Random point in Ost <gen>)
            • Unit - Change color of (Last created unit) to (Color of (Owner of (Picked unit)))
            • Set UnitStats[4] = (UnitStats[4] + 1)

Well this Trigger will work, but it leaks. Toprevent leaks create Groupes, and add Units to it.