Stateflow: Event guards on a loop with super step semantics switched on not behaving as I want

I have a timer which controls an events that is sent out at a particular frequency. I have a loop with one transition guarded by an event in the receiving statechart. I want to transition the event do a load of stuff in the chart, get back to the transition with the event guard and wait for the next clock tick/event. this doesn't happen in super state transition mode, the model doesn't stop at the event guard. How do I make the system stop at the event guard whilst using super step semantics? Probably some subtelty I am missing, think there must be some property of the event/ type of event guard I can use to do what I want without any trickery!

Thanks for any tips/ solutions

Richard