Hello again,
still no luck with your second suggestion. To keep things simple and avoid any interferences with other objects I created a new file with one only form. On that form I added one drop down list and populated it with three values (1, 2, 3). Then I added one button and copied your code in the exit event of the drop down list. Subsequently, selecting one of the values from the drop down list is unfortunately not updating the caption of the button.
Regards, Joel