Tips & Tricks
Buttons
Deleting Button Styles
Clicking the drop-down arrow alongside a button's style property lists all the button styles currently available in your project.
When you delete a button from a page, the button is deleted, but the button style is retained (since the button style may be in use on other buttons in your project, or you may wish to use it later on).
To completely remove a button style from your project:
The publisher will remove the files associated with that button style next time you publish your project.