Thank you Tore, that's the solution, I just found how to manage the bindevent:

BINDEVENT(name_of_external_form.object_name, ‘event_name’, source_object, ‘event_name_or_function_in_source’)

>>Good afternoon! please guide me with this: I need to create a right click event on an already created button in a form, I know that this form has a button called btnPrint and I need that when people right click on it performs "set printer to name getprinter()". This must be done in runtime that's the only way.
>>Thanks in advance!

>That's what BindEvent() is for, check Help for more info.