Bug 64760 add SINGLE/MULTI radios to ControlExample - Dialog tab - File Dialog Styles
should probably add a horizontal separator below the SWT.OPEN radio, then the SINGLE and MULTI radios below
examples/org.eclipse.swt.examples/src/org/eclipse/swt/examples/controlexample/DialogTab.java
* Handle a button style selection event.
	 *
	 * @param event the selection event
	 */
	void buttonStyleSelected(SelectionEvent event) {
		/*
		 * Only certain combinations of button styles are
		 * supported for various dialogs.  Make sure the
		 * control widget reflects only valid combinations.
		 */
		okButton.setEnabled (
			!(yesButton.getSelection () || noButton.getSelection () || 
				retryButton.getSelection () || abortButton.getSelection () ||
					ignoreButton.getSelection ()));
		cancelButton.setEnabled (
			!(abortButton.getSelection () || ignoreButton.getSelection () ||
				(yesButton.getSelection () != noButton.getSelection ())));
		yesButton.setEnabled (
			!(okButton.getSelection () || retryButton.getSelection () ||
				abortButton.getSelection () || ignoreButton.getSelection () ||
					(cancelButton.getSelection () && !yesButton.getSelection () && !noButton.getSelection ())));
		noButton.setEnabled (
			!(okButton.getSelection () || retryButton.getSelection () ||
				abortButton.getSelection () || ignoreButton.getSelection () ||
					(cancelButton.getSelection () && !yesButton.getSelection () && !noButton.getSelection ())));
		retryButton.setEnabled (
			!(okButton.getSelection() || yesButton.getSelection() || noButton.getSelection ()));
		abortButton.setEnabled (
			!(okButton.getSelection () || cancelButton.getSelection () ||
				yesButton.getSelection () || noButton.getSelection ()));