Disable a UI button via global setting - how to implement?

[ilya musayev]

I'm looking into a way of making ResetVM button disabled in some 
cloudstack environments. Ideally, i'd want it per zone, but its can be 
also Global Setting.

I don't want to disable the API ResetVM, just the UI button.
Would you know of a feature/button in cloudstack UI that follows a 
similar pattern and can be  used as a point of reference?

Thanks
ilya