I have a list button that appears on the enhanced list view and has "Display Checkboxes (for Multi-Record Selection)" checked.
It calls a VF page and it should present an error if no records are checked. The help docs show you how to do this in JS (https://help.salesforce.com/HTViewHelpDoc?id=links_useful_custom_buttons_mass_delete.htm&language=en_US) - anyone know how to do this in the VF page instead?
