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/WizardPage.java
* Method declared on IWizardPage.
 * The default behavior is to ask the wizard for the next page.
 */
public IWizardPage getNextPage() {
	if (wizard == null)
		return null;
	return wizard.getNextPage(this);	
}
/* (non-Javadoc)
 * Method declared on IWizardPage.
 * The default behavior is return the cached previous back or,
 * lacking that, to ask the wizard for the previous page.
 */
public IWizardPage getPreviousPage() {
	if (previousPage != null)
		return previousPage;
		
	if (wizard == null)
		return null;
		
	return wizard.getPreviousPage(this);		
}
/**
 * The <code>WizardPage</code> implementation of this method declared on
 * <code>DialogPage</code> returns the shell of the container.
 * The advantage of this implementation is that the shell is accessable
 * once the container is created even though this page's control may not 
 * yet be created.
 */
public Shell getShell() {