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/IWizard.java
*
 * @return <code>true</code> to indicate the cancel request
 *   was accepted, and <code>false</code> to indicate
 *   that the cancel request was refused
 */
public boolean performCancel();
/**
 * Performs any actions appropriate in response to the user 
 * having pressed the Finish button, or refuse if finishing
 * now is not permitted.
 *
 * Normally this method is only called on the container's
 * current wizard. However if the current wizard is a nested wizard
 * this method will also be called on all wizards in its parent chain.
 * Such parents may use this notification to save state etc. However,
 * the value the parents return from this method is ignored.
 *
 * @return <code>true</code> to indicate the finish request
 *   was accepted, and <code>false</code> to indicate
 *   that the finish request was refused
 */
public boolean performFinish();
/**
 * Sets or clears the container of this wizard.
 *
 * @param wizardContainer the wizard container, or <code>null</code> 
 */
public void setContainer(IWizardContainer wizardContainer);
}