HELP !! Real Time Windows Target - How to disable disconnect button ??

Hello everybody, I'm using real time windows target with students in order to control electrical machines (more than 2kW). After building the model, connecting to the target and running the model in external mode, I noticed that it is possible to click on the diconnect button without stopping the simulation. This leads to the crash of the computer (it restarts). The problem is : if the computer restarts, the electrical machine is no more controled and it can be dangerous ...

So, I would like to know whether it is possible to disable the disconnect button while the simulation is running ?? (it can be directly enabled when the simulation is no more running).

Thanks a lot ;-)