>I´d thought of it as two slightly different approaches, one where toy have a MyProperty on the form, and another where you just pass a variable, when it happens, or am I missing something here?

Yep :-) Its not related to the subjcte at all, just something I saw you do, you did this a couple times:

THIS.ENABLED=IIF(THISFORM.MyProperty=.T.,.T.,.F.)

That could be this, and without the IIF(), its now faster and quicker to type:

THIS.ENABLED = THISFORM.MyProperty