How do I stop or cancel a frozen backtest?

I am working on code for a robot, I can save but it wont let me compile it because the backtester seems to be stuck.

Is there a way to override the backtest and cancel it out?

There are 2 ways to halt it that I have found:

Remove the currency pair under the bot, 

or 

Close Calgo and reload it.

There has to be a better way.

Gary