You can't add a command button on top of an already existing command button. You first need to remove the command button for the laser power plant, make these two scripts:
Script 1
*** IF ***
True.
*** THEN ***
Set timer 'asd' to expire in 0.50 seconds.
Command button: 'Lazr_Command_ConstructAmericaPowerPlant' is removed from all objects of type 'Lazr_AmericaVehicleDozer'.
Script 2
*** IF ***
Timer 'asd' has expired.
*** THEN ***
Command button: 'SupW_Command_ConstructAmericaPowerPlant' is added to all objects of type 'Lazr_AmericaVehicleDozer' in slot number 1 (1-12).
I used two scripts as the game might crash if you remove and add the commandbuttons in one script, although I'm not sure about that, feel free to try it. There are other ways, but this should solve your problem.
Originally Posted by: UTD^Force