Bug 7235 [Contributions] Need dispose() for action delegates
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/action/StatusLineManager.java
* The status line control; <code>null</code> before
	 * creation and after disposal.
	 */
	private StatusLine statusLine = null;
/**
 * Creates a new status line manager.
 * Use the <code>createControl</code> method to create the 
 * status line control.
 */
public StatusLineManager() {
}
/**
 * Creates and returns this manager's status line control. 
 * Does not create a new control if one already exists.
 *
 * @param parent the parent control
 * @return the status line control
 */
public StatusLine createControl(Composite parent) {
	if (!statusLineExist() && parent != null) {
		statusLine= new StatusLine(parent);
		update(false);
	}
	return statusLine;
}
/**
 * Disposes of this status line manager and frees all allocated SWT resources.
 * Note that this method does not clean up references between this status line
 * manager and its associated contribution items. 
 * Use <code>removeAll</code> for that purpose.