Bug 95937 Leverage new initializeAferLoad method from JDT/Core
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/workingsets/EditWorkingSetAction.java
private IWorkbenchPartSite fSite;
	private WorkingSetFilterActionGroup fActionGroup;
	public EditWorkingSetAction(WorkingSetFilterActionGroup actionGroup, IWorkbenchPartSite site) {
		super(WorkingSetMessages.EditWorkingSetAction_text); 
		Assert.isNotNull(actionGroup);
		setToolTipText(WorkingSetMessages.EditWorkingSetAction_toolTip); 
		setEnabled(actionGroup.getWorkingSet() != null);
		fSite= site;
		fActionGroup= actionGroup;