We’ve extended custom buttons with two options: confirmation message and user input via standard edit form.
Fill this property with confirmation message which will displayed to the user before certain action, so the user to have to think about it before he finalizes the action. Leave this property blank if no confirmation is needed.
User Input via Edit form
This option allow you to use default edit form instead of selected columns for custom button with an user input required. Custom button assignments will allow you to initialize the columns with some values if needed. You can also use standard form behavior to control the form appearance.
will allow you to add a form behavior criteria for particular custom button only if needed.