Bug 49182 What should canceling setRawClasspath do ?
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/viewsupport/GoToBackProgressMonitorDialog.java
* The progress indicator control.
	 */
	protected ProgressIndicator progressIndicator;
	/**
	 * The label control for the task. Kept for backwards
	 * compatibility.
	 */
	protected Label taskLabel;
	/**
	 * The label control for the subtask.
	 */
	protected Label subTaskLabel;
	/**
	 * The Cancel button control.
	 */
	protected Button cancel;
	
	protected Button toBackgroundButton;
	/**
	 * Indicates whether the Cancel button is to be shown.
	 */
	protected boolean operationCancelableState = false;
	/**
	 * Indicates whether the Cancel button is to be enabled.
	 */
	protected boolean enableCancelButton;
		
	/**
	 * The progress monitor.
	 */