Pop-up list problems

Answer:
If you want a piece of code to execute when someone selects a value from a list box, you should add it to the Validate method for the list box, because this is fired whenever the Value for the list box changes through user interaction.

Regarding OPO prompting you to commit changes, this will only happen when you change a value in an object that is bound to a data column. If you want to allow users to change a value in a list box, you should have the list box be unbound and have a change in the Value of the list box ripple down to a hidden bound data field. Think about this before you do it, though, because you are subverting some of the powerful default features of OPO with this plan.