SWT Button

1. SWT uses Button to represent checkboxes, toggle buttons, and radio buttons.
2. You determine the type by the style constants.
3. You may pass only one of SWT.LEFT, SWT.CENTER, or SWT.RIGHT.
4. You may pass only one of SWT.ARROW, SWT.CHECK, SWT.PUSH, SWT.RADIO, or SWT.TOGGLE.
5. If you pass SWT.ARROW, you may pass only one of SWT.UP, SWT.DOWN, SWT.LEFT, or SWT.RIGHT.

Style	Description
SWT.ARROW	Creates a push button that displays an arrow.
SWT.CHECK	Creates a checkbox.
SWT.PUSH	Creates a push button.
SWT.RADIO	Creates a radio button.
SWT.TOGGLE	Creates a push button that preserves its pushed or nonpushed state.
SWT.FLAT	Creates a push button that appears flat.
SWT.UP	When combined with SWT.ARROW, displays an upward-pointing arrow.
SWT.DOWN	When combined with SWT.ARROW, displays a downward-pointing arrow.
SWT.CENTER	Centers the associated text.
SWT.LEFT	Left-aligns the associated text. When combined with SWT.ARROW, displays a leftward-pointing arrow.
SWT.RIGHT	Right-aligns the associated text. When combined with SWT.ARROW, displays a rightward-pointing arrow.