Bug 95937 Leverage new initializeAferLoad method from JDT/Core
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/workingsets/SelectWorkingSetAction.java
private IWorkbenchPartSite fSite;
	private WorkingSetFilterActionGroup fActionGroup;
	public SelectWorkingSetAction(WorkingSetFilterActionGroup actionGroup, IWorkbenchPartSite site) {
		super(WorkingSetMessages.SelectWorkingSetAction_text); 
		Assert.isNotNull(actionGroup);
		setToolTipText(WorkingSetMessages.SelectWorkingSetAction_toolTip);