structure of a button object.

param leftText

  can be used in place of an icon for display

param rightText

  usually used to represent a keyboard shortcut

param classes

  to control button display

param icon

  icon for the button face

param action

  indicates to the button the action to perform

param ctor

  the constructor of the button object

param group

  the logical group, used to group the ribbon buttons

param id

  unique ID for DOM selector

param dataElements

  can be used to give buttons in a group basic parameters

### Hierarchy

- ButtonDefinition

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