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/Wizard.java
for (int i = 0; i < pages.size(); i++){
		((IWizardPage)pages.get(i)).dispose();
	}
	
	if (defaultImage != null) {
		defaultImage.dispose();
		defaultImage = null;
	}
}
/* (non-Javadoc)
 * Method declared on IWizard.
 */
public IWizardContainer getContainer() {
	return container;
}
/* (non-Javadoc)
 * Method declared on IWizard.
 */
public Image getDefaultPageImage() {
	if (defaultImage != null) 
		return defaultImage;
	if (defaultImageDescriptor != null) {
		defaultImage = defaultImageDescriptor.createImage();
		return defaultImage;
	}
	
	return JFaceResources.getImageRegistry().get(DEFAULT_IMAGE);
}
/* (non-Javadoc)
 * Method declared on IWizard.