Bug 10458 Support DND to set focus in Hierarchy View
Please enable Hierarchy view to support DND as a way to "focus on" something, whether it be a project, source folder, package, or type.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/util/OpenTypeHierarchyUtil.java
return (element != null) 
			? (getCandidates(element) != null) 
			: false;
	}
	
	public static void addToMenu(IWorkbenchWindow window, IMenuManager menu, ISelection s) {
		addToMenu(window, menu, getElement(s));
	}
	
	public static void addToMenu(IWorkbenchWindow window, IMenuManager menu, Object element) {	
		IJavaElement[] candidates= getCandidates(element);
		if (candidates != null) {
			menu.appendToGroup(IContextMenuConstants.GROUP_OPEN, new OpenHierarchyAction(window, candidates));
		}
	}
	
	public static TypeHierarchyViewPart open(ISelection selection, IWorkbenchWindow window) {
		Object element= getElement(selection);
		if (element instanceof IJavaElement) {
			return open((IJavaElement)element, window);
		}
		return null;
	}
	
	public static TypeHierarchyViewPart open(IJavaElement element, IWorkbenchWindow window) {
		IJavaElement[] candidates= getCandidates(element);
		if (candidates != null) {
			return open(candidates, window);
		}