2 of 2 people found this helpful
Plain text and a maximum of three input fields is it for show custom dialog. BUT:
You can use a popover and then have the full range of layout design options, including value list formatting at your disposal.
You can open a new small window as your dialog and have the same options.
And in FileMaker 16, you now have "cards" at your disposal.
These days, I almost never use show custom dialog when data needs to be entered given its limitations.