Create a new event to be fired when step finished showing/displaying

[kabeza]

Is your feature request related to a problem? Please describe.
I cannot focus an input field just after showing actual step

asistente.on("showStep", function(e, anchorObject, stepNumber, stepDirection) {
    if (stepNumber == 1)
    {
        $("#dni").focus();
    }
    //console.log("Estas en el paso: "+stepNumber);
});

Describe the solution you'd like
Add a new event to SmartWizard so it is fired just after animation finishes or something like that so we can focus elements on the current Step

Describe alternatives you've considered
no idea

Additional context
none