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Starting 5.1, buttons have been categorized into Standard Buttons and Application Buttons.
These are buttons which have default standard behaviour implemented by the system. These have been moved to a separate palette attached on top of the form. Their colors, etc. can be individually changed using css but you cannot override their behaviour by embedding scripts, etc. There are special commands in the form to convert them into Application Buttons, if you need to embed scripts, etc. Standard Buttons are described below.