You can't test a global transition with the Opt/Alt + Click trick, as far as I know. You can have a state broadcasting that event for the global transition.
As Chouls says, if you have an FSM with 2 states, namely State1 and State2, and if you want to Alt + Click to pass from State1 to State2, a transition (let's call ToState2Ev) HAS to exist from State1 to State2, as well as a ToState1Ev should exist, if you want to test the transition backwards. Remember that click is to be done on the state, not the transition.
Check this screenshot I attached.