Bug 11109 F1 no longer works in Packages view
new context ID?
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
private void fillToolBar(IToolBarManager toolBar) {
		toolBar.removeAll();
		
		toolBar.add(fBackAction);
		toolBar.add(fForwardAction);
		toolBar.add(fUpAction);
		
		if (JavaBasePreferencePage.showCompilationUnitChildren()) {
			toolBar.add(new Separator());
			fMemberFilterActionGroup.contributeToToolBar(toolBar);
		}
	}
	
		
	private Object findInputElement() {
		Object input= getSite().getPage().getInput();
		if (input instanceof IWorkspace) { 
			return JavaCore.create(((IWorkspace)input).getRoot());
		} else if (input instanceof IContainer) {
			return JavaCore.create((IContainer)input);
		}
		
		
		
		return JavaCore.create(JavaPlugin.getWorkspace().getRoot());	
	}
	
	/**
	 * Answer the property defined by key.