[Zope] Xron method's tabs

Hi everybody, I've just installed the Xron product and created a Xron Method, first scheduled some hours ahead, and to be rescheduled after a day. When I tried the tabs in order to test it, it worked through the "view" tab, but failed (or did not get executed) when I used the "trigger" tab. Any help on what the "view" and the "trigger" tabs do will be greatfuly apreciated. (coudln´t find any doc beside the (same) add and edit help topics). Thanks in advance, Pablo.