pass boolean value from command button to PID module

Deal gents can controle 

I got a request from operation to create command button on one graph which selects between two PID modules . The operator can only control one of them. I've created the command button and change its caption each time the operators click. I need a way to write a value in the selected module to enable operator control and not this value in the other non selected pid to prevent any access to it

my question is what is the VB command to write in any module.parameter in Deltav?

I have Deltav 14.31

Deltav operate

I do not prefer to use global variable . I just need the opposite function to datalink function.

Thanks

Hossam