Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/wizard/WizardDialog.java
* @return the button bar control
 */
protected Control createButtonBar(Composite parent) {
	Composite composite = (Composite)super.createButtonBar(parent);
	((GridLayout)composite.getLayout()).makeColumnsEqualWidth = false;
	return composite;
}
/* (non-Javadoc)
 * Method declared on Dialog.
 */
protected void createButtonsForButtonBar(Composite parent) {
	if (wizard.isHelpAvailable()) {
		helpButton = createButton(parent, IDialogConstants.HELP_ID, IDialogConstants.HELP_LABEL, false);
	}
	if (wizard.needsPreviousAndNextButtons()) 
		createPreviousAndNextButtons(parent);
	finishButton = createButton(parent, IDialogConstants.FINISH_ID, IDialogConstants.FINISH_LABEL, true);
	cancelButton = createCancelButton(parent);
}
/**
 * Creates the Cancel button for this wizard dialog.
 * Creates a standard (<code>SWT.PUSH</code>) button and registers for its
 * selection events. Note that the number of columns in the button bar composite
 * is incremented. The Cancel button is created specially to give it a 
 * removeable listener.
 *
 * @param parent the parent button bar
 * @return the new Cancel button
 */
private Button createCancelButton(Composite parent) {