Get Forms SaveMode on AddOnSave Function

Hi, I need to know the forms Savemode on the function attach to "addOnSave" event

function "AddTimeSpentOnSave" is attached to forms OnLoad event and pass the execution object as parameter.
I found that getEventArgs() is null on the execution object when I try to use it in InitiateDialogForms()

AddTimeSpentOnSave: function(ExecutionObj) {
        OWB.CBS.Context = ExecutionObj;
        Xrm.Page.data.entity.addOnSave(OWB.CBS.InitiateDialogForms);
    },

    InitiateDialogForms: function() {
        if (OWB.CBS.Context != null && OWB.CBS.Context.getEventArgs() != null) {
            alert(OWB.CBS.Context.getEventArgs().getSaveMode());
        }

        if (Xrm.Page.getAttribute('owb_timespent').getValue() == null)
            OWB.CBS.OpenDialogForms(Xrm.Page.data.entity.getId(), OWB.CBS.ObjectTypeCode(Xrm.Page.data.entity.getEntityName()));
    },

does anyone know how to get the forms save mode when call a function attach to addOnSave?

thanks

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