FormControl documentation

# FormControl

FormControl inherits from FormObject and defines no instance variables. It has subclasses Button, PopupTrigger, and SelectorTrigger.

## Methods defined in FormControl:

### Methods for accessing:

- enabled: boolean
- label
- label: string freePrevious: freePrevious
  If freePrevious is true, the previous label string is freed (MemPtrFree).
- usable: boolean

### Methods for actions:

- onSelected
- push
  Simulate a button push.

### Methods for predicates:

- isEnabled
- usesModel

### Methods for utility:

- draw
- erase
- hide
- show

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