InfoPath Dev

I cannot find this documented anywhere.  In Infopath 2003 we used e.returnstatus=true.  What do we use in Infopath 2007?

e.CancelableArgs.Cancel = false;

You can only use e.CancelableArgs.Cancel = false on a submit.  What do you use on the click event of a button?  Is this still necessary with Infopath 2007?