Is it possible to tab out or click on button usign forms personalisation?
Has anyone tried it?
Yes, yes and yes

1) To tab out of a field you can use the built-in DO-KEY to NEXT-ITEM or NEXT-BLOCK
You can also use the GO_ITEM built-in to move focus to a specific item within a block
2) To click on a button is the sacred nirvana of forms personalization, and something in finally got to work last week. Most of the bloggs i've seen on the subject have not covered this at all which is why i was so chuffed to nail it.
For my example, i needed to mimic pressing the find button on the find person window (in the person extra info screen). To do this i first set the focus to the button using
GO_ITEM CTL_EMP.CTL_EMP_FIND_BUTTON
Next step is the clever bit.
Again using a BUILTIN use a builtin type of EXECUTE_TRIGGER and the argument is WHEN-BUTTON-PRESSED